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

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My water heater keeps shutting itself off and reading c7 ever since i shut my main breaker off 2 days ago . i turn it back on and it only works temporarily ! what to do ?

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C7 is no communication to remote control panel.
Try the steps below:

  • Shut down the remote panel.
  • Disconnect the unit from power.
  • Remove the heater cover.
  • Disconnect the wires connected to the remote panel from the circuit board. and remove wires connected to remote .
  • Put back the cover.
  • Restart the unit.
Ensure that you disconnected power before doing maintainance. Even if the procedure is simple , there is always risk to damage the unit, be very careful after removing the cover.

Posted on Sep 30, 2009

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1 Answer

I have Model PTG2-42PVN it shuts off and the remote flashes C7 and 76. What does this mean???


Could be the remote control. Disconnect remote and see if tankless works fine.

Probably bad PC board. Rheem will send new board and you can install yourself.

Bad PC board is kind of like the motherboard on your computer, so expect same level of performance after replacing motherboard ... which usually means the computer's days are numbered before another major problem.

Copy following links:
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Sep 18, 2012 | Water Heaters

1 Answer

Water got extremely hot and then tripped a breaker. now if i reset the breaker and turn on the hot water switch on the wall, all is good. but when i turn the switch on the hot water heater itself it trips...


Sounds like you have a short in wiring for 120VAC system of water heater. Shut breaker at panel off, and remove cover on back of water heater to look for any burnt wiring at connections such as switch, or thermostat/eco assembly.

Jun 10, 2011 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

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.

Feb 17, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

1 Answer

Rheem tankless propane hot water heater error code C7. Cant get hot water. It keeps shutting off and then once turned back on wont work and gives the C7 code. What does it mean?


Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76

Add a comment for more free help.
Also 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.

Feb 17, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

I replaced all parts but water heated won't get hot


You have electric water heater.
You replaced elements and thermostats but heater still won't work.
And tank was completely full of water, and water was running out of a faucet before turning power ON.
If elements are not fully immersed in water, they will instantly burn out.
If upper element is burned out, then tank will have NO hot water.
If lower element is burned out, and upper element is not burned out, then tank will have some hot water.
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-it-works.html

If elements did not burn out, then that leaves 1 main suspect: the electricity.

1) Push in ECO red reset button on upper thermostat. If ECO is tripped out, then heater will not work.

2) Click circuit breaker all the way one direction and then back the other direction to make sure breaker is latched.

3) If tank has 2 elements, then it is 240volt.
If 1 leg of 240Volt circuit is not working, then 240V appliance will not work.
240Volt circuit needs both hot wires to complete the circuit:
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html#120-240

Buy cheap multimeter from Home Center and set dial to 240-250-277VAC
Tape tester leads to woods sticks to keep hands away from power.
Power is ON
Test across top 2 screws on upper element should show 220-240 volts.
If you have 240 at top two screws, then skip down to step 6.
If no reading across top two screws, then move to top of tank.

4) Open connection point where wire connects to heater.
Test across both insulated wires should get reading of 220-240 volts.
If no reading, move to circuit breaker box.

5) Mark water heater breaker.
Turn off all breakers except water heater breaker and main breaker. (and breaker to light fixture where box is located)
Do not hold or touch or lean against anything metal.
Stand on dry boards and wear dry clothes.
If main breaker is OFF, the big wires that connect to main breaker are still HOT.

Remove box cover.
240Volt breaker has 2 wires connected with screws.
Test across both screws for 240Volt.
See if wires are loose.
If there is no reading, then breaker is not working on one leg.
To double check, move water heater wires to another same-size 240V breaker and then put ear against water heater to listen for bubbly-fizzing sound.

6) If you are getting 240 to water heater, then wire inside tank could be loose.
Do 30 minute troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer.

Jan 09, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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

Dec 23, 2010 | Rheem Tankless Hot Water Heater...

2 Answers

Rheem Tankless wh model rtg-74pvn shuts off error code c4 76


Contact Rheem; the Burner control unit has lost comm with the remote...the part is warranteed for up to five years.

Nov 01, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

4 Answers

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.

Sep 19, 2009 | Rheem EcoSense by 7.4 GPM Tankless Water...

2 Answers

Paloma PTG-74PVN power turns off by itself


turn the water flow off and control off and hold the two arrow buttons together
then use the up arrow to get to e and the down arrow to get to 1 what do you see?

Sep 09, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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