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

So you had water enter the burner combustion chamber through the access panel. That can be cleaned out, but was the gas control valve just above it on the water heater submerged under water as well? If so, do not use it or try to repair it. It is unsafe to use and the control must be replaced. Now whether or not it's worth while to replace just the gas control, depends on the age and condition of the water heater itself. Also, is this covered under your home owner's insurance policy? Damage from flooding is usually not covered in a standard policy,unless you had it added specifically. But it is covered if you had a water line break which resulted in the water damage. You should find out before you proceed with changing the control. We had the latter occur and our insurance co (State Farm) covered everything from clean-up to replacement). Hope that helps. Douglas

Rheem 40 Gallon... | Answered on Nov 01, 2018

The T.C.O switch which is located on the outside of the burner area needs replacing. It has two wire that connect to it from the gas valve. This switch controls the gas to the pilot burner tube. If it has tripped it will not allow the
pilot to stay lit or allow gas into the pilot tube.

Rheem 40 Gallon... | Answered on May 17, 2018

Call your gas company and have them check out the unit.

Rheem 40 Gallon... | Answered on Oct 24, 2017

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... | Answered on May 01, 2017

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.


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

Rheem 40 Gallon... | Answered on Jan 29, 2017

then have a plumber replace it .Plastic does not rust thru .

Rheem 40 Gallon... | Answered on Apr 15, 2016

A leaking water heater cannot be repaired, assuming it's the tank leaking and not nearby water pipe.

First thing is to protect your property from catastrophic tank failure where tank ruptures and water runs until it is shut off:
Tanks are under pressure when they are hot.
Close cold water shut-off located above tank.
Turn control knob to 'pilot' so pilot is lit but burner will not turn on.
Open hot side on tub for few moments to relieve tank pressure.

Now your property is safe.
You need a new water heater.
In mean time, gas water heater makes 41 gallons hot water per hour.
Shower used 5-9 gallons hot water.
Bath uses 10-15 gallons hot water.
You can turn on water heater for short stretches and limp by until you get a new heater.

Steps for installing gas water heater:

Rheem 40 Gallon... | Answered on Feb 02, 2016

Before calling service technician, here are links you can review Rheem and gas water heater manuals and information.

Typical power vent manual has troubleshoot steps that might or might not apply:

Post question on pro water heater forum

Find age of water heater:

Identify your product:

Rheem 40 Gallon... | Answered on Apr 29, 2015

Manufacturers say to replace water heater after a flood.
Flooded water heater can be repaired by replacing parts but warranty is voided.
And if water heater reached gas control valve, then gas control has to be replaced >> possibly the gas valve eco tripped.

I don't know how effective cleaning burner parts will be, since a small spider wed inside some of those tubes can cause water heater not to function. Small obstructions cause big problems.
I'm sure the plumber cleaned it out real well.
Find manufacturer using label on side of tank, find manual with parts diagram, and order burner parts.

It might be cheaper to install a new water heater yourself from box store

I read one article:
Guy has water heater that filled with water.
He says: "I decided to feel around. As soon as I put my finger into the hole under the burners I hit water. The air intake passage was filled with rain water, effectively chocking off the fresh air. A few minutes with a siphon tube cured the problem and the water heater works normally again."

Absolutely feel obligated to upvote the help.
Or take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Rheem 40 Gallon... | Answered on Feb 13, 2015

1) Try cleaning out and flushing water heater:

2) Problem could be that anode rod is depleted and water heater is rusting out.

3) If water heater is still under warranty, then contact seller or installer, or contact manufacturer directly.
Find age of water heater:

Rheem 40 Gallon... | Answered on Jan 08, 2015

If water is leaking from a pipe. then replace or repair the pipe or fitting. If the leak is coming from the unit itself, then replace the unit. Hope this helps.

Rheem 40 Gallon... | Answered on Dec 15, 2014

Replace the whole gas valve assembly

Rheem 40 Gallon... | Answered on Dec 13, 2014

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

Rheem 40 Gallon... | Answered on Dec 13, 2014

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.

Rheem 40 Gallon... | Answered on Dec 06, 2014

Dear Hank McNeal; I have successfully used a "boiler plug" to seal a water heater tank leak in 2007. It was a 100 gallon electric commercial hotel unit. To this day it's still in use. It depends where the leak is located....Predrilling the leak is necessary to be sure the plug will ernguage it's threads into good material... Start as small as possible, then use the best suited plug. they come in an assortment of sizes. rheem-glas-fury-model-22-40-gas-water-qbzdprdp3yetvbzozs4dsujq-4-0.jpg

Rheem 40 Gallon... | Answered on Dec 03, 2014

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
Most manufacturers do not support converting gas on heater.


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

Rheem 40 Gallon... | Answered on Sep 14, 2014

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