Question about Rheem Paloma PH-20R OFN / RTG-53XN Natural Gas Outdoor

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Gas comes on for only about 30 sec, then shuts off even if hot water supply continues running. Error message "C4 76" or "C7 76" on temp controller. (Paloma model, pre-Rheem).

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Faulty fan

Posted on Oct 12, 2009

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Unit shuts off when in use, code C7, 76


Before calling service technician, open following link for Rheem troubleshoot resources including error codes and typical manuals.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
C7 76 is problem with remote control. Following link might help.
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Read manual cover-to-cover to make sure your tankless water heater receives yearly maintenance required for unit to continue working.
Tankless are maintenance heavy which can quickly eliminate any promised energy savings unless you de-lime and troubleshoot and read tips-and-tricks others have written and glean information from service technician who visits your house. Mostly glean how much tankless repairs and parts cost vrs buying whole new tank-type gas water heater at local box store, since all costs are energy.

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1 Answer

For the past couple of weeks, when we try to use hot water in the morning the system shuts off. The error message we get is C7. Often we can turn off the control panel, turn it back on again and then it...


Sorry to read about your problem, I hope this helps you out.

Turn the power off and remove the cover. Find the two terminals that the remote control connects to and disconnect the remote control wiring. Turn the power back on and open the hot water tap and see if the unit comes on. If it comes on, this is a problem with either the remote itself or more likely the wiring between the remote and the tankless unit itself. Without a remote it will control to 120 degrees F. and will run without the remote.


I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

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1 Answer

Water heater heats water, but not long enough or sometimes not hot enough. The hot water runs out too fast, does not provide hot water continually


The first thing I would do is turn up temp control on gas valve.Control is located on front of gas valve at the bottom front of heater.They usually have a indicator dial on front with an arrow pointing direction.Turn dial to higher setting when burner is not on and this should turn burner on and provide hotter water. The control is normally turned clockwise to increase temperature.If control is already turned all the way up then water heater may need to be replaced.Depending on water quality in your area heater may have a large amount of mineral build up and it may not be capable of producing enough or hot enough water. If this the case all I can suggest is to try to drain tank and flush some of the deposits out. If you have installation manual it will give you instructions on how to do this. If not see if you have working shut off valve on cold water line ,if it works shut it off and connect drain hose to drain valve on bottom right side of gas valve. Put hose to floor drain or sump basin if you have one. Turn control knob on top of gas valve from on to pilot,this will leave pilot light on but prevent burner from working while draining. Open drain valve ,flow rate may be slow or not at all. Open hot water side of some faucet to provide air to help draining. You may try opening water supply valve to heater a few times to aid in draining. If you can get it to drain,shut drain valve off when done,turn cold water supply back on and shut off hot water outlet. Then when tank is full open hot water vavle to bleed air out of heater and piping. Turn control knob on top of gas valve back to on position. This should bring burner back on .It will take about 1/2 hour to heat. If you can't get it to drain or this doesn't help you might consider getting a new 40 gallon heater. Hope this helps. Thanks

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1 Answer

Will run for 3 min and shut down error code C5 and 12 or C7 and 12


hi my names pete ill try and help c7 is where the start up sequence has ended c12 is saying gas service has been interupted hope this helps

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My new tankless WH stopped working. It gives hot water for about 15 sec, then starts flashing C7 12 or C2 11. How can I fix this, We had it for a month now & it worked before.


11 The Gas Shutoff Valve is not opened
completely.

12 Gas Service has been interrupted.
LP Gas is running low. (LP models only)

I think C7 is where the startup sequence ended...and then you get the error code

If less than a month old...contact your customer support

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Rheem Eco-180dvn. Error code 12


actually, does it give you a big rumble? if it does, then your problem is that the meter's btu's are not high enough and there's too litle gas getting to the heater so it's blowing itself out, basically. you'll need to call your gas provider and ask for them to bring in a higher btu meter. around 220,000 btu meter is best, so your furnace and gas stove(if you have one) dont take to much gas themselves, meaning dont get a 180,000 btu meter, because it would only be able to supply the heater.

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Rheem RTG 53 PVN with fault codes C4 or C7


I had the same problem with my tankless waterheater (flashing c4 76 alternately). I called Rheem
tech support and they had me 1 power down the remotepanel 2 unplug the unit from the wall 3 remove the cover 4 remove the wires for the remote panel from the circuit board and pull the twisted pair that goes to the remote out from the bottom of the unit. 5 reinstall the cover 6 plug the unit back
into the wall and turn on the hot water see if it works. It did in my case and they are sending me a new remote panel. I hope it helps.........

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