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My rheem tankless hot water heater is not heating. It quit working after a very windy day. We woke up one morning with no hot water. We hit the on/off button and it worked for a day. Now it gives a blinking C7 76 reading on the screen. I can hit the on/off button and wait a few minutes and turn it back on and get a priority 120 reading. When I turn on the hot water it takes about 30 seconds and the redlight M comes on and then shortly thereafter the C7 76 starts blinking. Any suggestions on fixing it?

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If it is gas the wind could have blow into exhaust and caused it to overheat

Posted on May 03, 2010

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I own a salon and have 2 Rheem 60 gal 50,000BTU Gas hot water heaters. I am still running out of hot water during the work day. My question is because the hot water heaters are on the 3rd floor, it is...


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If tankless computer is less than 5 years old, then call Rheem for local technician qualified to work on this type of computer that heats water.

If tankless is older than 5 years, then replace with tank-type electric water heater for $285 from Lowes.

Avoid Rheem, Richmond, Palmoa, GE water heating products since this company does not post service manuals.

Choose AO Smith, American, State, craftmaster, Whirlpool etc.

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My Takagi TK3 isn't heating as it should. Had a tech out and he adjusted the dip switches to 140 degrees, which worked for a while but now it barely heats to 100 degrees. Gas flow rate appears to be...


Is tankless computer older than 5 years? Imagine how well a 5-year old laptop computer works.

Setting temperature to 140 degrees might be the basic problem:
Read following resource:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature

I doubt this Takagi computer unit was maintained as shown in product manual, and that heat exchanger was not delimed each year as shown in product manual. So the heat exchanger is probably heavily coated with un-removeable scale... since yearly deliming will not fully remove scale on tankless units, the tankless computer is designed to sprial downward in efficiency despite glossy brochures that promise endless and effortless hot water for 20 years ... as if any computer will last 20 years:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime

Since you are not getting error code, the problem might be crossover, or some other plumbing problem:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#no-error
http://waterheatertimer.org/Crossover.html

I always recommend replacing tankless computer with tank-type water heater for $385 for same-day do-it-yourself solution and to save the endless expenses that arise with computer-driven water heaters.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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Rheem RTG-66DVN shuts off 1-2 times a day


You received recommended answer posted ago.
Probably same answer today:
Don't install tankless, especially in location where there is no service technician available unless you expect to heat water by setting tankless out in sun.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Repair any brand tankless, any error code or problem, same day, yourself for $385:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add comment and give link to service manual that you located.

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Error c4-15 what does that mean


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

C4 can range from failed PC Board to lime build-up inside heat exchanger
Error 15 is 'heat exchanger is too hot', clogged heat exchanger, restriction in cold water inlet, temperature set point too high.
If you recently changed temperature setting, then that might be cause.
Tankless require monthy-to-yearly maintenance to avoid common error codes.
Delime tankless and clean water filter, keep temperature low.
Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

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Before calling service technician, open following link for troubleshoot resources include Rheem chat, error codes, and regular maintenance manual, and possible product manual:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Clean the water filter as shown in product manual.
Error E1 is not specifically shown for Rheem/Pronto tankless.
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E errors are related to temperature, so E1 can be temperature sensor failure on hot water pipe.
E errors can be loose/bad wiring or part failure.

Error codes are considered start-point for troubleshoot.
Each tankless manual recommends cleaning the water filter monthly, deliming heat exchanger yearly, and cleaning combustion chamber and burner parts yearly.
Regular maintenance can prevent most common error codes, but the cost and nuisance will outweigh expected $1-8 monthly savings on gas bill.
The requirement for continual maintenance should signal folks that tankless are not effortless hot water as described in tankless promotion.

Solve most tankless problems same day, yourself, any brand, using minimal tools for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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1 Answer

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Before calling service technician, open following link for troubleshoot resources including Rheem chat and contact, possible manual, error codes, etc.:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C8 76 is generally bad PC board. Call 800-432-8373
Just like a motherboard on your computer, the tankless PC board is operational center of tankless water heater.
Various sensors gather information from water pipes, gas line, vent pipe, and air supply to determine when to activate burner.
Most people understand that when their computer motherboard needs replacement, that computer will probably not work reliably again.

Tankless is basically connecting a complex computer to your plumbing and electrical lines and to a gas burner with a vent pipe to outdoors, despite knowing that plumbing lines, vent pipes, gas burners, and household electrical systems have plenty of problems on their own.

Age factor: When tankless is new and everything operates perfectly, the tankless works correctly.
And each tankless manual recommends yearly and monthly maintenance, just to maintain operation, the cost of which can exceed the expected 1-8$ monthly savings. And who wants to clean the water filter each month and delime the exchanger every year?
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Don't buy a tankless water heater because the only folks promising unlimited hot water and effortless water heating experience while saving money with a tankless are the tankless promotors.

Solve most tankless problems yourself, same day, any brand for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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

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