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

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Our hot water heater isnt worlking we had a power outage this afternoon and since the poweer came back on the temp control panel gives an error message when the hot water tap is turned on, it says A1 then 79

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You proably have a fan motor fault or the circuit board got damage when the power came back on..you will need to contact rheem

Posted on Aug 12, 2010

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ER3 error code on amtrol hot water tank


Simply means hot water heater called for heat for 1 hour and never rose in temperature or reach stepping, unit automatically goes into lockout. I would reset power

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We lost power for two days and now the power is back on. We still have no hot water and the water heater sounds like its continually running water.


Bets say you have an electric water heater. shut off the electricity to the unit (typically in the breaker box), and then the water inlet valve. Locate the TPV valve, either on top of or near the top on the side, of the unit. Generally they have a small lever attached.

Depending on where in the home the heater is located, if indoors it should have thawed by now, outdoors it may still be frozen, remove the panels covering the elements. each of the elements will have a thermostat, each may be equipped with an independant reset button. press these. if one or the other seems to reset (a noticeable 'click), replace the covers.

ONLY if you were successful in resetting the thermostats, restore power, and wait 30 minutes. SLOWLY open the water supply, and watch for water leakage, listen for water flow(make sure all faucets are OFF first) Freezing can rupture the tank, ice can hold the TPV open, so there is a good chance your water heater is trash. Exercise caution.

In freezing conditions with a power outage, ALWAYS open the hot water someplace in the home to allow water flow(not full stream) to prevent freezing.

Dec 14, 2014 | Water Water Heaters

1 Answer

Rheem Power Vent 50 gas water heater will not come out of vacation mode! Have tried turning on and off, resetting and following directions on the side of the tank. Will not come out of Vacation Mode. Had a...


Water inside tank-type water heater can remain hot for some time.
That's one advantage of well-insulated tank-type water heaters.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

Power outage can be related to failure of gas control.
Unplug stuff when power goes out. And then plug back in after power is restored.
Water heaters with electronics are not protected from surge.
Electronics can blow out during and after power outage. For example nearby lightning strike will cause current to run along household wires. With ordinary power outage, once power is restored, the surge can affect all kinds of electronic circuitry such as timers, water heaters, water softener, treadmill etc.

Sounds like you have intellivent gas control valve:
Open following link to identify gas control, and download typical manual, and download intellivent service manual with troubleshooting, error codes, etc.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#intelli

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And take advantage of fixya expert assistance live.
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1 Answer

I have a Rinnai MC-45 US. One morning, we had no hot water & the temp on the control panel read 12. So I pushed the Priority button. We now have hot water, but the priority button is still lit. It has...


Error code 12 can sometimes be caused by a short circuit on the low voltage side of the installation. Could possibly be a fault with the controller itself which is low voltage.

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1 Answer

Our Rinnai tankless water heater is producing water as hot as pre


Power outage will reset Rinnai unit to that temperature. Read manual for more info.

Nov 28, 2009 | Rinnai Water Heaters

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

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1 Answer

I have a paloma ptg-74pvn and the digital temp. display keeps shu


How reliable is your AC? With the digital r/c connected, every time the heater recovers from power outage it's in the OFF default state. If you can not fix the power issue, disconnect the remote control. The w/h will recover in the ON state.

Nov 13, 2009 | Rheem Paloma Tankless Water Heaters...

1 Answer

Power outage caused c8 / 76 error - No Hot Water


How old is your unit...if less than 5 years old tell Polam/Rheem customer support you are recieving a code 76 error - this is a loss of communication between the remote and the burner control assembly. Part will be covered under MF defect warranty. However, the part is covered....the labor to install is not.
If you are slightly technical you can install the part yourself...customer support will walk you through the process and they give you a step-by-step procedure to follow.

Sep 24, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Reset button for tankless water heater


you need to unplug the unit, wait for 30 seconds reset the temp to the lowest temp, then try it, if this does not work it might have done something to the circuit board, are you on a gfi out let it needs to be there is water and ele, and should be on the gfi with a reset on it,,

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10 Answers

Paloma PTG 74PV N1 Tankless Water Heater - stops heating


Most likely problem is the remote control not the main board. A safe temporary fix is to unplug the heater from the 110 volt outlet, remove the two low voltage wires from the remote control and use a small wire nut to connect the two conductors together. Plug the heater back into the 110 outlet and the heater should work just fine. The default water temperature is about 118 degrees at the heater. Replace the remote control ASAP.

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