Question about Rheem 40 Gallon FVR NATGAS Low WATER HEATER 6YR 22V40SF

1 Answer

When desired temp. is reached the water heater pilot goes off. I have replaced thermo-couple, it makes no difference. when water cools down, pilot must be re -lit manually. when it reaches desired temp. pilot will go off again. WHAT IS THE PROBLEM

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1 Answer

Pilot will turn off if thermocouple is not seated fully in the flame, or if thermocouple is bad.
When replacing thermocouple, there are good videos on Utube.
Finger tighten new thermocouple then add 1/4 turn, so the insulator is not crushed.
Make sure new thermocouple is seated fully in pilot flame.

You might also need to clean out burner tubes:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

Read manual for troubleshoot checklist, and recommended maintenance and advisories.
Cleaning the burner parts and combustion chamber should be done periodically.

I know it sounds old-hat to say read manual, except each model is slightly different with different recommendations.
Generic 22V40 manual on following link:
http://bostonheatingsupply.com/Rheem%20Res%20Gas%20Fury%20Water%20Heater.pdf
Page 23 has a few DIY steps that include replacing gas control thermostat.
New gas control can cost $60 - $120.
Also air in the gas line, low gas pressure, gas shut-off not fully open, pilot orifice clogged.
Problem may be combination of several factors, requiring clean out and replacement of parts.

If repairs cost more than $330, then buy and install new gas water heater from local box store:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Upvote the help.
And 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.

Posted on May 19, 2011

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I take it is on an RV?

The placement of the thermo coupler would be important - but no bigger hammer required... lol

be sure your connections are good and nothing got pinched off...

Alternatively there are some systems which have a lock out which may have happened and you might need a reset or otherwise let it cool down completely

or it might not have been the thermo coupler to begin with...


Best regards
ck

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