T and p valve leaking and i replace it and pressure pushes out hot water
It sounds like it's doing it's job, by not letting your water heater turn into a missile, or exploding....The "T" in T&P stands for temperature. When it gets too high, the valve will open. The "P" in T&P stands for pressure. When IT gets too high, the valve will open. When they both get too high...you know the rest...The condition can be caused by many factors.
1. The house "pressure reducing valve" is letting in too much pressure. Any more than 80 lbs. is too much. 50 to 75 is good.
2. Hot water expansion in a closed loop system...no "prv" or "water meter" bypass...To fix, you can install a small "expansion tank" above the water heater. It will allow the extra bit of water to go somewhere temporarily, Letting the T&P valve stay closed. Installation is always on the hot outlet side, because high efficiency water heaters use a "check ball" in the factory installed cold water inlet nipple, which also doubles as a dip tube. (lets cold water into the heater at the bottom)
When a gas fired water heater turns on, there is a pretty fast spike in both temp. and press.
3. The gas control valve itself, has a non resetting 190 degree, "high limit" safety shut off feature. IF that were to fail, the control would run away temperature wise, but I have never heard of one failing.
regards!
Pressure Switch for a Richmond Power Vent is located in the Blower Hood, Remove the Hood from the top of the water heater, take off the 3 screws on the side panel (NOT THE TOP WHERE IT STATES DO NOT TAKE APART) You'll see the valve with the square hose on it, remove the hose and take a partially bent paper clip, slide it thru the hole to the fan until it pokes thru, scrape back an forth to remove any debris, also try to run it about an inch up the valve, place the black square tube on to the nipple which you cleaned out going to the fan and blow on it, if you can now blow thru it should work, connect the other end to the valve and reassemble being sure to tighten the clamps to the pipe heading outside. Turn on furnace and it should now work.
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