Top 20 Rheem 40 Gallon FVR NATGAS Low WATER HEATER 6YR 22V40SF Questions & Answers


The water heater uses a thermocouple to generate a small voltage from the pilot light. This voltage is used to blink the led and allow the main gas jet to turn on. Either your thermocouple or the wiring from it has failed and needs to be replaced, or realigned if perhaps it moved out of position above the pilot light.

Rheem 40 Gallon... | 211 views | 0 helpful votes


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!

Rheem 40 Gallon... | 174 views | 1 helpful votes


no.
propane burns much hotter than natural gas, and has higher pressure
gas valve and burner and orifice must be changed to switch between natural gas and propane
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
Most manufacturers do not support converting gas on heater.

Gene

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Rheem 40 Gallon... | 615 views | 0 helpful votes


You can reset some models.... depending on gas control valve and FVIR design.
Some newer models you replace the sensor located on outside of tank.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-flammable-vapor-sensor-works-Therm-O-Disc-25VS.pdf

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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the flue doesn't stay warm creating a draft...if you are not using it, you can cap it off

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Replace the whole gas valve assembly

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If heater has a sealed front door the air intake filter is probably clogged. Remove the door and vacuum out all the dust and debris in the inside. Then use an air compressor to blow down thru the filter and force out any dust caught in the underside of the filter. Reinstall assemble heater and relite. If problem continues replace the gas control. If unit does not have sealed door just replace the gas control

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Copy following link to identify gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Gene
h

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Rheem 40 Gallon... | 26 views | 0 helpful votes


Copy following link for replacing gas control valve thermostat on water heater:
http://waterheatertimer.org/How-to-replace-thermostat-on-gas-water-heater.html
Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Rheem 40 Gallon... | 38 views | 0 helpful votes


Troubleshoot by type of gas control valve
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Repeated 3 flash on power vented honeywell gas control thermostat means system in lockout.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

Repeated 3 flash on atmospheric-vent Honeywell gas control valve means temperature sensor failure.
Take apart gas control, and buy temperature sensor if sold separately at AO Smith dealer.
http://waterheatertimer.org/How-to-replace-Honeywell-gas-control-valve.html

Add a comment with more information

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Rheem 40 Gallon... | 375 views | 0 helpful votes


You don't, the pressure valve is a safety feature and you don't fix them you replace them.

Rheem 40 Gallon... | 58 views | 0 helpful votes


1) Copy following link for general steps how to take apart combustion parts:
http://waterheatertimer.org/How-to-replace-thermocouple.html

2) Copy following link for troubleshoot-igniter pdfs:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

3) Newest gas water heaters require replacing whole combustion assembly.
Older models can be taken apart and igniter replaced separately.

4) Unfortunately Rheem does not post service manuals, or show basic service steps in their product manuals. Parts vary by model number

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Rheem 40 Gallon... | 67 views | 0 helpful votes

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