Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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No hot water

On remote control it flashes co 90 and no hot water.

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  • jcaballero41 Feb 22, 2009

    model rtg53xn error code c7

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  • 332 Answers

Check the flue pipe make sure there is nothing blocking it out side and make sure they are all pushed together properly,, I think the is the code for cabon minoxide sot the exhaust is being pulled back in thru the cold air intake, it won't lite if it does this

Posted on Jun 06, 2009

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1 Answer

Can I put my central heating on a different time from my water horstmann didam 425


It appears there are 4 trippers on the daily time dial that control all timing. 2 On and 2 OFF

On the right side are override switches for Hot water and Heating
You can only separate Hot water and Heater programming a little bit.
You can choose to have Hot water ON all day, or turn on-off once per day or turn on-off twice a day. Or OFF all day.
The Heater has the same options and the same on-off times as the Hot water.

Manual:
http://www.horstmann.co.uk/files/2513/9867/2118/user_guide_425-TiaraDiadem1.pdf

For fully separate programming, where Hot water and Heater can each be programmed differently, you would need a 2-channel controller like the Grasslin QE2
http://www.grasslin-controls.co.uk/towerchronqe2.html

http://waterheatertimer.org/pdf/Grasslin-QE1-QE2_GB-instructions.pdf


Gene

Oct 11, 2014 | Water Heaters

1 Answer

Remote is flashing C8 and 76, alternating. I turn the unit off, then back on, and I get hot water for about 10 seconds, then it goes cold and the same error message occurs. Unit is Rheem Main Remote...


Before calling service technician, open following links for Rheem tankless resources including error codes and Rheem chat.
Disconnect wires from remote to see if system stabilizes. Unit will heat to default temperature without remote.

Error codes are considered start-point for troubleshooting.
C8 76 can mean PC board failure.
76 can mean communication failure with remote control
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Jul 31, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

My rheem was flashing IL . I flushed with 2 gallons of vinegar for 45 minutes. however when I restarted it still is flashing IL. Does something in the remote need to be reset?


Before calling service technician, open following link for Rheem tankless troubleshoot resources, including on-line chat
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Rheem technical service bulletin for de-liming:
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

De-liming Manual says:
10. Turn on the water shutoff valves, run a hot water tap to
purge any air from the water lines and check the system
for any leaks.
11. Turn on gas, electricity, and remote control thermostat
and set the desired temperature.
12. Run hot water from several locations to check the operation
and performance of the water heater.
If you have difficulties please contact the Technical Service
Department at 1-800-432-8373 or your local service agent.

Apr 18, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

Why does my hot water always turn off after a couple minutes


the 90 error code will be caused by one of two things:
1. the incoming gas pressure is low
2. the unit is dirty and needs to be cleaned

Jun 30, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

My tankless remote digital controller won't go above 76 degrees F


76 is an error code. Look in the owners manual and it will tell you what the problem is.

May 31, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

Remote control unit flashes 76. No buttons on the remote will function. Water heater will not come on when there is a demand for hot water. Any suggestions?


Remove power source from the unit. If remote control is installed; remove cover and lift the control wires on the terminal...can be accomplished from either end.

Restore power and see if unit functions normally.

Contact Paloma/Rheem customer (800-432-8373) support and notify them IF you are getting a code "76" error. Rheem has recently extended the warranty on the "Burner Control Assm."; which is your problem. The C4-C8 portion of the error code, is where the unit stops the ignition process...burner fails to light, or gives you intermittent hot water. In either case, contact customer support .

If this helps, please indicate so.
Mike//jzklipper

Nov 25, 2009 | Rheem Rtg53xn Natural Gas Tankless Water...

1 Answer

Rinnai *85e remote hooked up no hot water and no reading on remot


did you turn the unit off before hooking it up ? Any function on a tankless rennai the pwer has to be turned off and the priority button has to be pushed in,, if you have the manuel it tells you haw to do this,,

Feb 24, 2009 | Rinnai Digital Remote Water Heater Control...

1 Answer

No hot water out of a rtg-74pvp-1 tankless water heater


in order to reset the unit you will have to turn the temp all the way down then unplug the unit for 5 min,, remember it is a computer and it knows, after plugging in back in after the five min, reset the temp open up a fauset while doing this, that way it will be regestering the flow of water to set the temp by

Dec 18, 2008 | Rheem Tankless Hot Water Heater...

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