Jan 29, 2019 · Faulty water inlet valves. One of the most common reasons your hot water heater may be leaking at the top could be due to a faulty water inlet valve. Take a look at the top of your water heater. If you see a puddle of water, this is more than likely the problem. First locate the nut that’s attached to the handle of the water heater and tight ... 1. Leaking Drain Valve. A hot water heater’s drain valve is threaded into the bottom side of the tank and flushes out any sediment that collects inside. If you find water in your water heater pan, a leaky drain valve is likely the culprit. Check the valve’s outlet with a paper towel to see if this is where your water is coming from.If you have that volume of water running through your pipes, it's underground, under the slab or flooring. Turn off your shutoff at the water heater to determine if it's on the hot or cold. If it's on the hot, walk around with a laser thermometer to try and find the source of leak. To pin point cold water unfortunately, you need a …Turn the handle screw about halfway back into the stem. Position the handle puller’s post against the screwhead and press the arms together behind the handle. Turn the post clockwise until the handle pops loose. Remove the handle screw and handle. Then pull off or unscrew any tub faucet trim behind it. Step 4.Hydronic baseboard heaters are more commonly dubbed as hot water baseboard heaters in some social circles. Unlike their electric counterpart, hydronic baseboard heaters will utilize a form of centralized heating by channelling incredibly hot water through a series of pipes to each baseboard heater unit located in individual rooms.Fortunately, in many instances, the source of the water is a leaking pressure relief valve. Pressure relief valves can begin to leak for a variety of reasons. Fortunately, in most cases, replacing the pressure relief valve solves the problem quickly and inexpensively. Most pressure relief valves for water heaters can be purchased for around $15.Immediately turn off the valve nearest the supply side of the leak. In some cases, a shut-off valve is located on a pipe right before or above the water heater and may have a red handle. To turn it off, rotate the handle clockwise or, if it is a lever like the one shown in the photo at right, pull the lever 90 degrees.Small leaks of water could mean you need to top up your boiler pressure; The pressure relief valve could be releasing extra pressure The heat exchanger – the important part of your boiler where cold water is warmed up with hot gas – could be damaged; The joints where the heating system pipes meet the boiler may have been badly sealed.Immediately turn off the valve nearest the supply side of the leak. In some cases, a shut-off valve is located on a pipe right before or above the water heater and may have a red handle. To turn it off, rotate the handle clockwise or, if it is a lever like the one shown in the photo at right, pull the lever 90 degrees.A guide to help you deal with a water heater leak, from finding the cause and location of the leak to installing a leak detector and replacing the water heater. Learn how to stop the …Learn how to fix a leaking water heater with a T&P valve, a pressure-reducing valve, or a check valve. Follow the steps and watch the video by Richard Trethewey, a plumbing and heating expert.If the geyser is leaking hot water for so long, it is a signal of danger, and urgent attention should be given to the geyser. Top 5 reasons behind water heater overflow pipe leaking in a geyser: High Temperature; When the temperature is very high in a heater, it might be the reason behind the water heater overflow pipe leaking.If there is water leaking or dripping under your car, it could be from the air conditioning system, which is normal. It might also be caused by rainwater that’s been run over or condensation from the exhaust. More alarming, it could be a leak from something dripping inside. Here is a more detailed list of the causes of water dripping or ...Oct 30, 2023 · Hot Water Heater Leak Repairs vs Replacement – Cost Comparison. When deciding between repairs or replacement, here is an overview of typical costs: Typical Hot Water Heater Leak Repair Costs: Pipe or Joint Leak – $150 – $350 for parts and labor ; Valve or Gasket Leak – $200 – $600, depending on part Sep 24, 2019 · Hot Water Tank is Leaking? Top 5 Fixes | Repair and Replace. AMRE Supply. 190K subscribers. Subscribed. 5.8K. 839K views 4 years ago Water Heater Troubleshooting & Repairs. Why is my... Dec 22, 2022 · Learn how to diagnose and fix a leaking water heater from pipes, tank, or valves. Find out the causes of drips, spraying, or flooding and the steps to take to prevent or repair the problem. Get tips on replacing …20 May 2019 ... 1 Answer 1 ... The straightforward solution is to call a plumber to replace the heater. If you are not skilled at sweating copper and have the ...Feb 8, 2024 · Dry up as much of the water as possible and do a visual inspection of the water heater for oblivious signs of leakage. Allow the water heater to sit for several hours to see if the water returns. If the water does not return, restore power to the water heater and set the temperature to a maximum of 125°. To check, dab the area dry then wait to see if the water appears again. If it does, you can try turning the connector by just a quarter turn using a spanner to see if this stops the boiler from leaking water. It may be that a seal has come loose and just needs to be tightened. However, corrosion can cause some seals to wear away, allowing water ... What to do when you find water under your gas fired water heater. Showing where to look to determine where the water is coming from and if the leak is repair...If your hot water heater appears to be leaking, take a look at the pressure relief valve. All hot water heaters come equipped with a pressure relief valve and it is normally located on the side of the tank. The valve is a safety device to prevent the tank from rupturing in case of runaway temperatures or an unsafe pressure build-up.Leaking Hot Water Tank . A leak from the hot water heater needs to be fixed as soon as possible. Not only can a leak reduce the temperature of the water, but it can also cause severe injury to unsuspecting individuals who …25 Sept 2019 ... These leaks can indicate that there is too much pressure in your tank. It's important to take action as quickly as possible if you suspect this ...If the leak is from the tank you may be able to repair it with an anode replacement, but a crack is fatal. Here are some specific hot water leak repair steps depending on the source. Replacing a leaking hot water anode. Changing a hot water anode will prolong the life of your hot water system and inhibit tank corrosion.Sep 24, 2019 · Why is my water heater leaking? In this episode of Repair and Replace, Vance shows how to troubleshoot leaks in a gas or electric water heater. If you notice... Leaks Around the Base of the Faucet . A leak around the base of the faucet, where the faucet body meets the sink, is not quite as obvious since users are constantly splashing water around the sink deck and base of the faucet. But if you frequently see puddling water on the sink deck around the faucets, you may have a leak in this area.Jan 15, 2024 · Replacing a drain valve is cost-effective to stop a hot water heater from leaking from the bottom. A new valve can cost $10 to $30. However, plastic drain valves are not preferable since they are more prone to damage than brass drain valves. A brass drain valve can cost from $17 to $30 if it has a garden house cap. Call Mott Plumbing now on 8462 9844 for 24/7 emergency hot water repairs and replacements across Adelaide. A leaking hot water system or hot water service isn’t something to ignore. You might only realise there’s …Cut the power: This is the very first thing you should do when you find a hot water leak. To turn off the energy source leading to: Gas water heater: Find your thermostat. You should see a little knob with three settings: ON, OFF, and PILOT. Switch it to OFF or PILOT to shut off the gas and make the heater safe to work on.22 Jul 2008 ... Its possible, but more than likely its coming from either the tapping on top of the tank or from the top seam. If its an electric hot water ... In addition to high water temperature, increased pressure within the tank can lead to leaking from the pressure relief valve. This valve is designed to release excess pressure, protecting the tank from potential damage or explosion. Be cautious around the pressure relief valve, as it may release hot water and steam. Water Heater Leaking From the Tank. In most cases, a water heater that leaks near the bottom points toward an issue with your drain or T&P valves. Even so, it’s also entirely possible that the leak is actually coming from a hole in the tank itself. Most modern water heaters have an insulated tank that holds the hot water.2 Vital Things To Check If Hot Water Tank Leaking From The Bottom. If your device is leaking from the bottom, you must check the pressure relief valve and thermostat temperature setting. Pressure Relief Valve. The pressure and temperature relief discharge pipe runs down the unit and stops 6 inches above the ground.(HERE’S WHAT TO DO) Most of the time, a water heater leaking is due to faulty plumbing connections or valves that have failed. At the very least, a leaking hot water heater is an … How To Fix a Leaky Cartridge Faucet: Pry off the decorative cap on the handle, remove the handle screw, tilt the handle back, and pull it off. If there’s a threaded retaining clip holding the cartridge in place, use needle-nose pliers to remove it, then pull the cartridge straight up. Remove the spout and cut off the old O-rings using a ... With a bottle of leak-sealing product on hand, remove your hot tub filters. With the pump running, follow the leak-sealer manufacturer’s instructions and pour ¼ to 1/3 of the bottle (this will depend on bottle size) directly into the filter area, which is also where your suction intake is located. Take note of the water level and allow the ... The packing nuts on the cold and hot water shut off valves could be loose, or the washers could be worn out. Tightening the packing nut or replacing the washers is enough to fix the problem. If you have a double bowl kitchen sink and it only leaks when running the garbage disposal, the garbage disposal is surely the cause of the leak.22 Jul 2008 ... Its possible, but more than likely its coming from either the tapping on top of the tank or from the top seam. If its an electric hot water ...If your hot water system is dribbling water it is either releasing pressure from the water tank (which is a normal safety feature) OR the valve is faulty. Here’s how to tell the difference between the two. Hint, the main things to monitor are: the amount of water that’s dribbling from your hot water system; how often it’s leaking Put a deep well socket wrench over the metal stem of the faucet that is leaking. Use it to grip the valve nut as the base of the stem. Unscrew the valve nut and put it aside for later. Remove the wrench and nut from the valve. Using your fingers, carefully pull the metal stem out of the wall. Skylights are prone to leaking, especially during heavy rainfall. As more and more water collects at the top of a skylight, it will eventually leak through if the edges aren’t seal...May 4, 2023 · Your homeowners insurance policy should cover any sudden and unexpected water damage due to a plumbing malfunction or broken pipe. However, most home insurance policies exclude damage to your home that occurred gradually, such as a slow, constant leak, as well as damage due to regional flooding. Additionally, some types of damage that are ... 13 Jan 2020 ... Your cold water inlet and hot water outlet are located at the top of the unit where the pipes connect to it. If the leaks are happening here ...After this, remove the overflow pipe connected to the pressure relief valve and use a pipe wrench to unscrew the leaking valve. Once this is done, use Teflon tape to wrap it around the threads of the replacement valve, and screw it tightly into place. Reconnect the overflow pipe and open the cold-water cut-off valve.How To Fix a Leaky Cartridge Faucet: Pry off the decorative cap on the handle, remove the handle screw, tilt the handle back, and pull it off. If there’s a threaded retaining clip holding the cartridge in place, use needle-nose pliers to remove it, then pull the cartridge straight up. Remove the spout and cut off the old O-rings using a ...Pour the water out of the coffee pot, turn off the machine, and unplug it from the wall. 6. Let the white vinegar sit in the water tank for two hours. 7. After two hours, remove the brew funnel and the spray head (located directly above the coffee pot). 8. See if any mineral deposits are stuck in the spray head.The unvented hot water cylinder was invented by a british civil engineer called Thomas Hawksley in 1861 from Arnold in Nottinghamshire. He was born on 12th July 1807 and died 15th September 1893 aged 86. In 1985 to 1986 the building regulations and the water bylaws were passed and then the unvented hot water cylinder was then allowed in the uk.Water Heater Leaking From the Tank. In most cases, a water heater that leaks near the bottom points toward an issue with your drain or T&P valves. Even so, it’s also entirely possible that the leak is actually coming from a hole in the tank itself. Most modern water heaters have an insulated tank that holds the hot water.When your boiler’s pressure is too cry, the pressure release valve (PRV) will either let out the water causing a leak or some parts. internally may fail which in turn leads to a leak. Most boilers have a pressure gauge which should be around 1.5 bar and green, especially if you have a combi Boiler.In the summer heat the valves in your hot water system can leak, they are designed to release a small amount of water – especially on hot days – to regulate the pressure in the water tank. If, however, the release is a little more than the occasional drip, you may have a leak on your hands, this means you’ll be paying to heat water, only ...InSinkErator has several models under its hot water dispenser line. Although made with quality in mind and designed to last long, certain factors make issues like leaks possible. While it’s natural to be alarmed, some of the common causes of leaking water dispensers can be remedied without much fuss. How to Fix a Leaking HotIf your hot water heater appears to be leaking, take a look at the pressure relief valve. All hot water heaters come equipped with a pressure relief valve and it is normally located on the side of the tank. The valve is a safety device to prevent the tank from rupturing in case of runaway temperatures or an unsafe pressure build-up.Confirm whether the leak is coming from defective plumbing. Turn off all faucets and water-using appliances in your home, and write down the number on the water meter. Wait about 3 hours. Check the water meter again: if the amount of water used has increased, you’ll know that the leak is coming from indoor plumbing.Check Valves & Gaskets – Replace worn rubber gaskets on valves and fittings to prevent leaks. Adjust Temperature Setting – Lower heat temperature to 120°F – 140°F maximum to avoid pressure fluctuations. Install Leak Pan – Place the hot water heater in a leak pan plumbed to the exterior to contain spills.What Are the Causes of Water Heater Leaks? · Old tank. Tank-style water heaters older than about 15 years leak more often than newer heaters. · Drain valve. · ...Now, wait for 15 to 20 minutes, then see if the leak appears. You might see water or watermarks on the ceiling below or when you look in the basement or crawl space. Once you have confirmed there’s a shower leak, you can begin to address the issue. The following are five causes of a leaking shower and how to troubleshoot them. Related Article(HERE’S WHAT TO DO) Most of the time, a water heater leaking is due to faulty plumbing connections or valves that have failed. At the very least, a leaking hot water heater is an …15 Apr 2021 ... Hot water cylinder leaks can also come from: · the cold-water inlet and hot water outlet connections · the temperature and pressure hot water ...Water can cause alot of damage in a short period of time. Fixing water leaks quickly and correctly can save you money in the long run. This sink was leaking ...Be sure that there are no loose components to ensure that no other issues will occur. Step 4: Test it. To ensure that there are no leaks anymore, be sure to test them after repair. After that, when everything is working fine already, wipe the dispenser with a clean cloth.Your water heater leaking from overflow pipe may be due to: Sediment accumulation in the tank. Faulty valve/overflow pipe due to age. Keep in mind that if your hot water heater tank becomes pressurized, it can open up automatically and release water.Dec 6, 2018 · Hot water system leaks will likely go unnoticed until you do not have enough hot water or even worse, no hot water at all. What To Do When Hot Water Heater is … Put a deep well socket wrench over the metal stem of the faucet that is leaking. Use it to grip the valve nut as the base of the stem. Unscrew the valve nut and put it aside for later. Remove the wrench and nut from the valve. Using your fingers, carefully pull the metal stem out of the wall. If your hot water heater appears to be leaking, take a look at the pressure relief valve. All hot water heaters come equipped with a pressure relief valve and it is normally located on the side of the tank. The valve is a safety device to prevent the tank from rupturing in case of runaway temperatures or an unsafe pressure build-up.Drips Or Leaks Noticeable. One more common sign that you need to go for a thermostatic mixing valve repair is having water seeping out from parts. There could be water accumulated beneath on the floor as well. This is most probably due to a corrosion issue or even a faulty seal could be the reason. How To Fix a Leaky Cartridge Faucet: Pry off the decorative cap on the handle, remove the handle screw, tilt the handle back, and pull it off. If there’s a threaded retaining clip holding the cartridge in place, use needle-nose pliers to remove it, then pull the cartridge straight up. Remove the spout and cut off the old O-rings using a ... 13 Jan 2020 ... Your cold water inlet and hot water outlet are located at the top of the unit where the pipes connect to it. If the leaks are happening here ...Turn off all water faucets in your home and make sure the washing machine and dishwasher are not running. Check the water meter and make a note of the numbers you see. Come back in an hour and ...Oct 7, 2021 · That said, if your water heater is leaking from the pressure relief valve, it may be just doing its job. If the valve is only leaking while the tank is hot, it may be that the tank needs to be refilled to a correct level with the proper air gap. An air gap at the top of the tank allows for some expansion, and sometimes this space is reduced ... Having an ice maker in your refrigerator is a great convenience, but it can be a source of frustration when it starts leaking water. Leaks can be caused by a variety of issues, fro...7 Nov 2019 ... 4 Reasons Your New Water Heater Tank Could Be Leaking · 1. Poor Connections · 2. Faulty Relief Valve · 3. Non-Faulty Relief Valve · 4. Le...Oct 7, 2021 · That said, if your water heater is leaking from the pressure relief valve, it may be just doing its job. If the valve is only leaking while the tank is hot, it may be that the tank needs to be refilled to a correct level with the proper air gap. An air gap at the top of the tank allows for some expansion, and sometimes this space is reduced ... Learn how to fix a leaking water heater with a T&P valve, a pressure-reducing valve, or a check valve. Follow the steps and watch the video by Richard Trethewey, a plumbing and heating expert.Most sinks will have two valves, one for hot water and one for cold. We would recommend turning off both while you work, even if it's only one faucet that is leaking. Do this by turning the valves until you can't turn anymore. Then run the faucet until no more water comes out, this will help release pressure from the pipes.The average hourly rate for plumbers is between $40 to $200. A drain valve leak can take up to 4 hours to fix. Therefore, you’re looking at a total fee of between $160 to $800. If the plumber sees it better to replace the water heater, they’ll likely charge you between $600 and $1800.The water isn't hot when using the boiling water function. If you're running your boiling tap and the water temperature is lower than before, check for these common issues: The tank is not plugged into the mains socket properly. Try switching it off, removing the plug and plugging it back in. Check for any damage or leaks around the socket.Water heaters typically have hot water in them. It might be an emergency if you find your place flooded by an overflow pipe leak. Not only that, but the hot water can also scald you. Hot water can leave you with severe burns even at the recommended setting of 120 degrees. In such cases, your best bet would be to call a professional …Our team of fully licensed and trained plumbers and electricians can complete efficient, effective repairs and replacements for a wide range of hot water system brands and models. Don’t leave your home at risk of any water damage and contact us now to fix your leaking hot water system. Call us on 1300 762 260 or complete our hot water ...Why Is My Hot Water Heater Leaking? · 1. Leaks from Water Heater Pipe Connections · 2. Loose Drain Valve · 3. Leaky Pressure Relief Valve · 4. Moisture ...1. Corrosion in the Tank. One of the primary reasons for hot water system leaks is corrosion that occurs within the tank. Over time, the metal components of the ...If the leak is from the tank you may be able to repair it with an anode replacement, but a crack is fatal. Here are some specific hot water leak repair steps depending on the source. Replacing a leaking hot water anode. Changing a hot water anode will prolong the life of your hot water system and inhibit tank corrosion.When a water heater’s temperature is set too high, the water heater will be more susceptible to leaks, as the pressure inside the hot water heater is much greater. While it is possible to correct water heater leaking simply by tightening nozzles and valves, you might be facing a corrosion issue, which would mean you would have to replace the corroded and …Too little or too much pressure can cause a problem and so you should check the valve every now and then and add or remove water as required. If your boiler is leaking, you should check the pressure gauge to see if the pressure is too high. If this is the case, it’s likely that the pressure relief valve (PRV) is trying to release some of the ...Step #3: Check the Valves for Leaks. More than anything, a solar hot water roof leak is likely going to occur near one of the valves. Closely examine all of the parts of your system in which valve, pipe fittings, and other hardware are … Leaking Hot Water Tank. If the leak seems to be coming out of the top or bottom of the tank, then it's likely that one of the internal components of the tank has malfunctioned. It's also possible that the structural integrity of the tank itself is compromised. Loose Or Worn-Out Connections. The fittings and hoses of the system can get loose ... Sit down and kick your leg forward. Hold this position for a few seconds before lowering your leg slowly. Lay down and raise your legs at a 90° angle. Point your toes towards your head to extend your legs. Hold this position for a few seconds before relaxing your feet. Lay down on one side and raise your leg.Water heaters typically have hot water in them. It might be an emergency if you find your place flooded by an overflow pipe leak. Not only that, but the hot water can also scald you. Hot water can leave you with severe burns even at the recommended setting of 120 degrees. In such cases, your best bet would be to call a professional …If your hot water system is dribbling water it is either releasing pressure from the water tank (which is a normal safety feature) OR the valve is faulty. Here’s how to tell the difference between the two. Hint, the main things to monitor are: the amount of water that’s dribbling from your hot water system; how often it’s leaking How To Fix a Leaky Cartridge Faucet: Pry off the decorative cap on the handle, remove the handle screw, tilt the handle back, and pull it off. If there’s a threaded retaining clip holding the cartridge in place, use needle-nose pliers to remove it, then pull the cartridge straight up. Remove the spout and cut off the old O-rings using a ... Jun 3, 2023 · Pay attention to the drainage patterns around the house. Insulate pipes on exterior walls in climates where they might freeze. Keep your water pressure between 40-60 PSI. Home Improvement. Don't panic if you have a water leak or see water coming through the wall. You may be able to fix it without opening up the wall. Here’s what to do if your furnace is the leaky appliance in question: 1. Turn Off Your Furnace. You can simply adjust the thermostat or flip the furnace switch. There should be what looks like a light switch on or near your furnace, but if you can’t locate it, just turn it off at the breaker box. 2.
May 19, 2023 2:46 PM EDT. What should you do if your hot water heater is leaking? cmannphoto via Canva Pro. Is Your Hot Water Tank Leaking? If you've noticed water on …. Exterior design
The first thing to do is to determine if the leaking water from your faucet is cold or hot. That will give you an idea of which tub faucet washer you need to replace. Note that if you don’t want to do another repair for some time, it is best to replace the 2 washers and seats. Most often than not you will find out that the water is hot/warm. Step 2: Turn off the cold water valve. Your water heater gets its water from the cold water supply. It should have a shut-off valve at the cold inlet. Turn the lever to the off position. If your tank has a wheel on it, turn it clockwise until the water shuts off. At this point, you do not need to drain the tank. How To Fix a Leaky Cartridge Faucet: Pry off the decorative cap on the handle, remove the handle screw, tilt the handle back, and pull it off. If there’s a threaded retaining clip holding the cartridge in place, use needle-nose pliers to remove it, then pull the cartridge straight up. Remove the spout and cut off the old O-rings using a ... Air bleeder vent valve leaks - leaks can occur at automatic air bleeder valves or air vents wherever these vents are installed on hot water heating systems including at baseboards, expansion tanks, air scoops, or radiators. See AIR BLEEDER VALVES used to purge air from hot water heating piping, baseboards, radiators, and from the boiler itself. andJan 15, 2024 · Step 3: Drain about 10 gallons from the water heater. Next, we need to drain the water level beneath the valve, about 10 gallons of water from the tank. To do this, connect a garden hose to the drain valve located at the bottom of the water heater. Direct the garden hose outside or to a floor drain. Whether it’s an accidental pen leak or a forgotten ink stain on your favorite shirt, removing ballpoint ink from fabric can be a daunting task. One of the most common mistakes peop...An indoor central air conditioning unit may be leaking water due to a buildup of excess condensation on the internal cold evaporator coil, a blocked condensate drainage pipe, a rus...After Canada, now Australia has found that controversial facial recognition company, Clearview AI, broke national privacy laws when it covertly collected citizens’ facial biometric...Jun 21, 2022 · Cut the power: This is the very first thing you should do when you find a hot water leak. To turn off the energy source leading to: Gas water heater: Find your thermostat. You should see a little knob with three settings: ON, OFF, and PILOT. Switch it to OFF or PILOT to shut off the gas and make the heater safe to work on. After this, remove the overflow pipe connected to the pressure relief valve and use a pipe wrench to unscrew the leaking valve. Once this is done, use Teflon tape to wrap it around the threads of the replacement valve, and screw it tightly into place. Reconnect the overflow pipe and open the cold-water cut-off valve.The following are the most common faulty parts that cause leaks. Faulty Inlet Valve. The water inlet valve, which is usually located where the hot and cold inlet hoses enter the washer, controls the hot and cold water that enters the tub. A leak from the water inlet valve is usually caused by body cracks or a faulty seal.Water leaks can be a homeowner’s worst nightmare. Not only do they waste water, but they can also cause significant damage to your property if left untreated. Identifying the signs...This Old House plumbing and heating expert Richard Trethewey shows how to quickly, easily fix a faulty valve. (See below for a shopping list and tools.) SUBS...To fix the leak, shut off the water at the meter and at the home's main water shut-off valve, if it has one. Use a string to connect your meter to the point of entry into your home; the pipe should run beneath the string. Using a shovel, dig until you expose the break in the pipe, then dig well below and to the sides.30 Jan 2021 ... If the drain valve is not completely closed, is loose, or is damaged, water will leak from it. This might look like a tank leak, but it is ...The tank has corroded causing cracks or fractures to appear that enable water to leak out. Unfortunately this usually means a replacement hot water system is ... Shut the water off at the water main. Using a bucket, drain the hot water heater just enough to get below the pipes and the top of the tank. Use copper pipe and push fittings to connect the expansion tank. Cut the cold water line above the tank using a pipe cutter, then push both ends of the pipe into both sides of the push T fitting. 2. Check the Thermal Expansion Tank. If you have a thermal expansion tank installed but still water is leaking from the temperature and pressure relief valve, either the tank is waterlogged or the air pressure in it is too low. Sometimes the bladder in the expansion tank ruptures, and as result the entire tank fills with water..