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Electronic control Board not working. Cannot Locate Source of new board.

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Did you call whirlpool? all you need is the model and serial number and they should be able to send one out to you

Posted on Aug 02, 2009

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What is error code 76 on a Rheem tankless hot water heater that has propane connection?


Communication Fault with Remote Control. At a minimum check the following: 1. Check remote control wiring for loose or damaged connections. 2. Bypass remote control cable by connecting remote control directly to remote control terminals on PCB. Replace cable if found to be faulty. Yes Either the wiring or the remote control is at fault. To rule out the wiring, disconnect the remote control and use a short, good jumper wire and connect directly to the remote terminal on the PCB. If the unit works using the remote, then the wiring is at fault. If the unit does not work, then the remote is at fault. Did the unit go to main burner? No Replace the Printed Circuit Board Remove remote control wires from wiring terminal on the PCB. Plug unit in and open a hot water source.

Dec 16, 2016 | Rheem Water Heaters

1 Answer

Water heater not working. Light is off o electronic board but has 220 power going to it.


Still I would check the power cord, the connector and the switch. Then I would check fuses and in the heater if the overheating security did not trip.

Jan 31, 2015 | Whirlpool Water Heaters

1 Answer

Installed new board on rheem rtg74xn and it will not turn on or off , how do i get it to work i am technician asking before i get there what could it be!?


Most likely he did not program board with program chip....... Most of the boards i have had to replace, came unprogramed and had to program them thus the chip ...... I take setting off the old board and adjust the settings on the new board..... this really needs to be done by someone with experience working on the unit........

May 20, 2012 | Rheem Paloma Tankless Water Heaters...

1 Answer

Thermostat model UMC 117 keeps coding C7 why?


Generally, C7 is communication problem with remote
Error codes are considered start point for troubleshoot.
Causes can be: Bad remote, bad wire to remote, loose wire connection at remote, loose wire connection at unit, bad PC board.
In no particular order:
Check wire connections.
Disconnect remote and let water heater control temperature at default 120 degrees F, and if no further problem develops, then that might eliminate PC board as source of problem.
Replace wire to remote.
Replace remote.
Call service technician to diagnose problem.
Contact Rheem about PC board and other options.

Before calling service technician, open following links for troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

Aug 14, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Our water heater is doing the same thing. . Before I replaced the board I checked the elements, both were about 13.5 ohms, after checking I made sure to replace all insulation and closed the access covers...


1) You have given good diagnostic information ... except brand and model number of water heater are missing.
Locate this information on label on side of tank.

2) 2 flashes for high temperature indicate you have Whirlpool or Craftmaster Energy Smart.
You have dual element 240V tank-type electric water heater with electronic control board and temperatures sensors.
Sensors can be ordered separately for $30 each.
Sensors seem like best suspect since elements test out and you have new control board.

3) Did you test elements for short to ground through center of element?
http://waterheatertimer.org/How-to-test-water-heater-element.html

4) Energy smart requires 10 gauge wire and 30 amp breaker. If wire or breaker are undersized, then I would expect chronic problems with electronics. I believe the requirement is so element draw or other factors don't starve electronic control board.

5) How it works: Energy smart is non-simultaneous water heater. Non-simultaneous means upper element turns on first. When upper temperature sensor is satisfied, control board cuts power to upper element and sends power to lower temperature sensor and element. So both elements are never ON at same time. Lower element runs until lower temperature sensor is satisfied. I do not know decision tree for how microchip processes the information.

6) I have examined this water heater and read the manual. I wrote following page, but have not conducted electrical testing on unit simply because it is controlled by micro-chip.
http://waterheatertimer.org/Whirlpool-Energy-Smart-electric.html

7) Sample Energy Smart manual:
Manual does not show how to test temperature sensors, but manufacturer might have more information. Manufacturer might have information how changing meter can affect their electronics.
I would guess undersized wiring would have greater impact than electricity turning off for 1 minute.
http://waterheatertimer.org/pdf/Whirlpool-energy-smart-electric-manual.pdf
Whirlpool 1-877-817-6750

8) 4500 Watt elements should test 12.3 ohms, so your elements check out fine.
Be sure to test for short to ground by setting multimeter to ohms, remove wires from element, and test each screw to bare metal part of heater and to metal base of element.
http://waterheatertimer.org/images/ohm-reading-for-emements.jpg
http://waterheatertimer.org/How-to-test-water-heater-element.html

9) The water heater industry changes very fast, so current manual is best place to start troubleshooting.
If you have different brand than shown above, then open following link to identify manufacturer's website:
http://waterheatertimer.org/Water-heater-manufacturers.html
Add a comment if you need help finding information

10) Post question on professional water heater forum for more eyes on same question:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 13, 2011 | Water Heaters

1 Answer

My tankless indoor water heater has an error code C4 76


Error code 76 indicates a communication error with the electronic board and the unit. Call Paloma/Rheem with the serial number and model number of your unit and they will, in most cases, send you a new board with instructions on how to easily replace the board.

Tech Support: 800-432-8373.

Nov 21, 2010 | Rheem Paloma Tankless Water Heaters...

2 Answers

I am having the same problem as posted by jek01 on Aug 1, my Rheem Tankless Hot Water Heater is not powering off, after two years of use with no issues. I also have to turn the breaker off and wait a short...


Remove power source from the unit. If remote control2.gif 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 support2.gif.

If this helps, please indicate so.
Mike
jzklipper@aol.com

Oct 11, 2009 | Rheem Tankless Hot Water Heater...

3 Answers

Error code 76 C4 heater shuts off every 5 mins while in shower


Remove power source from the unit. If remote control2.gif 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 support2.gif.

If this helps, please indicate so.
Mike//
jzklipper@aol.com

Oct 01, 2009 | Rheem RTG-53PVN Indoor Natural Gas...

1 Answer

Electronic ignition tries to lite, clicks 5 times, then goes POOF


Gas burners go "poof" when they have too much gas in the area upon lighting. This is normally due to the ignition source not being close enough to the initial source of gas. This is normaally corrected by ensure the main burner is clean so that it distributes the gas correctly and having the ignition source at proper strength and location. I would have to have good schematics of your heater to be more specific. I hope this helps.

Sep 09, 2009 | RTO Atwood Water Heater - 6 Gal LP

2 Answers

No hot water, control board light stays green


It may be bad thermostat terminals of the water heater, or, alternatively, the very top heating element is in need of replacement. See this handy diagnostic article for more info:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Home_Improvement_Zone_Heating_Systems_Water_Heaters_Cold_Water_Still_Released_Despite_Water_Heater.htm

Hope this helps.
Brad

May 11, 2009 | Water Heaters

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