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Rheem 21V40S-2 does not heat water

We have a Rheem 21V40S-2 installed in 1999 in the attic; it is gas-charged; we bought the house 2 yrs back and can only guess that the heater has neither been serviced nor replaced in the last 10 years.

Anyhow, since the last week or so the heater has stopped heating; i.e. water coming out is not hot at all; went over to check out the heater and here is what I observed: 1) just looking at the exterior there doesn't seem to any visible difference (no overflow, no discharge etc.) 2) the air hose that is connected to the heater and exhausts through the roof had come unplugged from the joint where it exhausts out of the roof; i reconnected the hoses for now so that it is properly getting the air it needs; did not make any difference - the water is still not hot; 3) I left a couple taps on for a few minutes and during this time tried to see if there was some activity inside the heater (like sound of water being heated etc..); it is still very silent..

can one of you help out on what is going on? I am hoping this doesn't mean a big bill.. all help is appreciated

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All brands and models have a flow switch which protects the heat exchanger from overheating, a very common problem is calcium build up in the heat exchanger which reduces flow and causes the flow switch to shut off the burner. Can be fixed by descaling the heat exchanger. We have a kit available at heaterup.com its safe and easy to use.

Posted on Jul 14, 2009

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Pilot light needs re-lit? aDVISE IF THAT IS NOT THE PROBLEM

Posted on Jul 11, 2009

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1 Answer

Rtg74pvn2 rheem tankless water heater gas problem


1) You want the truth: Forget tankless.
There are many tankless water heaters with insoluble problems.
And endless problems.
Rheem knows it.

2) Do you really expect your home computer to work flawless after replacing motherboard?
Get your money back from Rheem, or get a full replacement.

3) OR fix water heater yourself today: Install tank-type gas water heater for $350 from local box store.
FYI: Do not buy Rheem, Richmond, Ruud, GE as these units from Rheem have problems that require service technicians.
Instead buy Whirlpool, American, State, Craftmaster, Reliance, Kenmore, as these units from AO Smith have fewer problems and can be repaired by homeowner using simple part replacement.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

4) Copy following link for troubleshoot resources, and possible manual for Rheem, Richmond, Paloma water heaters:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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Pilot light keeps going out during hot days


Solution is probably better ventilation to gas water heater.
On hot days, heat and lack of ventilation can cause pilot outage.
Hot air causes oxygen molecules to move farther apart, and combustion is no longer supported so pilot goes out.

Open following links:
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
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The hot water just turn cold by it self and wont come back. I have to go to the attic and unplug and then plug back, it will then work. It does this again next time in the shower, midle of the shower,...


Before calling service technician, open following link for troubleshooting resources, including possible manual, and Rheem chat.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Rheem usually asks you to call local service technician.

There are many factors that cause problem you describe: bad PC board, sensor problem, loose wires, crossover in single-handled faucet, lime build-up in heat exchanger, clogged water filter.
The remote control might give you an error code. Error code is a starting point for troubleshoot.
Error code on one unit can have different cause than same error code on different unit.

Read manual for required maintenance.
Tankless require yearly maintenance.

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.

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Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Sometimes people attach tankless to tank-type heater to preheat incoming cold water.
Additional tanks are also used to store solar heat, and some installations have tank-type because tankless is unreliable. Service technician can sort out the function correctly.
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Owner should read tankless manual thoroughly, especially troubleshoot and maintenance sections. Tankless require yearly maintenance.

Since tankless are expensive to repair and replace, you might be able to fire up the tank-type water heater and provide hot water without much cost.
You can also install tank-type gas water heater yourself. Lowes sells 40 gallon for $317.00, and then you offer 10% less.
http://waterheatertimer/How-to-install-gas-water-heater.html

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