Question about Rheem 43VP50E2 Power Vent Induced Draft Natural Gas Residential Water

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Pressure switch failed to open - Rheem 43VP50E2 Power Vent Induced Draft Natural Gas Residential Water

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1) Copy following links:
Troubleshoot by type of gas control valve.
Also Scroll up and look on right side for Pressure switch troubleshoot resources.

2) Post question on pro water heater forum:

Posted on Dec 30, 2012


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Pilot does not ignite?

Look for the pattern of flashing lights when it fails after you turn the power off/on. Then look at the wiring diagram / instructions on the inside of the panel. The flah pattern should be listed. For example, two green flashes and pause, repeating may mean that the exhaust flow is not sufficient, or another flash pattern may indicate pilot is not lighting.

Likely ly a pressure switch is bad or exhaust is blocked.

May 17, 2015 | Water Water Heaters

1 Answer

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 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 "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.

Dec 06, 2014 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Alpha cd28c boiler loosing water and pressure through pr valve when heating is on,and when then switched off needs repressuring to use heating obvious pr valve been fitted.pressure

I assume losing pressure through the PR means Pressure Relief Valve (PRV) or temperature pressure (TPR). Open in TPR may mean boiler is overheating/overpressurized. Open in PRV means the Pressure Reducer/Fill Valve in the fill line of the boiler is broken.
House Water Pressure in a home is 30/40 PSI min to 60-80+PSI max.
Boiler PRV/TPR are set at 30 PSI open (SYSTEM PRESSURE) so too high a house water pressure will open the PRV/TPR. Replace the reduction regulator on/in the fill valve assembly

Oct 20, 2014 | Water Heaters

1 Answer

Rheem Water Heater and the LED light is flashing 4 times which according to the manual states the the "Vacuum Safety Switch is open and fails to close to sequence, how can i fix this

Rheem does not post service manuals:
Here are resources that can help solve problem:
1) Troubleshoot by type of gas control valve using other water heater manufacturer's service manuals: Service manuals are very large pdf files.
2) Scroll up on same page and on right side is heading 'Pressure Switch' with 2 related pdf files.
3) Post question on pro water heater forum

Oct 06, 2012 | Rheem Tankless Hot Water Heater...

3 Answers

Triton opal shower showing low pressure,when there is no low pressure!

In the top of the water inlet valve at the bottom of the unit there's a plunger that rises when the water is switched on. this activates a small switch at the bottom of the pcb and cancels the low pressure warning. this is free to turn in the valve and over times may rotate stopping the plate on the top from contacting the switch on the pcb. If this has happened just turn the plunger back to the correct position.

Aug 28, 2009 | Water Heaters

1 Answer

Water heater gives out cold water for about 30sec then goes back hot

Pressure is not enough to operate pressure switch due to the several problems.
It needs to open it up and check if diaphram or similar device that operates switch is intact. If the mechanism is ok, than check the water inlet for obstruction or dirt (if there is a filter clean it) same goes for the outlet.

Jul 08, 2009 | Rinnai Water Heaters

1 Answer

Led flashes 4 times indicating 'open pressure switch' I exchanged the pressure switch with an exact model and it still does the same thing. Doesn't heat up because of open PS

Sounds like the control board is the problem and not the pressure switch. I would do a continuity test on the new switch just in case you received a bad one.

Mar 19, 2009 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Gas central heating boiler. insuffient water pressure.

u need to have a key (its like a T shape key) and u put that under the boiler its a hole in there, than u open the tap which is near this hole.

Oct 31, 2008 | Water Heaters

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