Question about Rinnai Digital Remote Water Heater Control Mcc-45-4us

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

The water heater (Paloma) stopped providing hot water afer a period where womtimes it would and sometimes it wouldn't. The heater is at a cabin so we only use it every so ofter, I cleaned the water filter, vacuumed out the unit, plugged and unpluggged the unit and then connected the remote digital controller (which befoe was not connected. The situation is not changed except the temperature flashes 76 all the time.

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  • 34 Answers

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

Posted on Jun 11, 2010

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Posted on Jan 02, 2017

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Paloma model no. ptg2-42pvp


http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
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I have c7 code


it is a communication problem between remote control and tankless unit

Temporary fix:
1 Turn off electricity to tankless and remove cover. Find two terminals that remote control connects to.
2 Disconnect remote control wiring. Turn electricity back ON.
3 Open hot water tap and see if unit works as expected.
4 Without remote, tankless will heat water to default 120 degrees F and will run without the remote.
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Use following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

http://www.palomastore.com/paloma_error_codes.html
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1) Replace remote control
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Add a comment for more free help.
Also take advantage of fixya expert assistance live.
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Dec 29, 2010 | Rheem Tankless Hot Water Heater...

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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.
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1 Answer

I also a Paloma tankless water heater that is 2 years old. I am now getting an error code C7 76 also. Is this something I can take care of, or should I call a plumber to address?


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.
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If you look on the left hand side of the burner control module you'll see 4 capacitors - the capacitors have most likely failed...pretty sure anything code 76 is P/S failure. It may also be covered for manufactures defects. If the cap is blown..the top will be slightly raised as apposed to flat like the other nearby caps - they are called top blow capacitors...the damage should be evident.

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did you check the filters on the the water valves, i am not exactly sure about your codes that are shoeing but if you could read it and post them, i know on some of the units 76 means there is low water pressure and the filters are behind 2 caps one on each side above the shut off valve take off the caps and remove the screens, clean them and replace them ,, make sure you turn off the water on both side first or you will get wet

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http://www.rheemtankless.com/content/tankless/rheem/help.shtml

This is there website.Above.
Use the live chat to ask them, the code you listed does not seem to correspond to there code list, the only code that does is code 76,
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