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

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Model RE2424 W-Z (SP) one the 2 remote controllers is not displaying any power lights or 2 digit display. The other unit still works and the heater unit is functioning ok. Would like to get the other controller to work. The 2 wires are still plugged into the rear of the control unit. no apparent disruption to the wires or water ingress into the control unit?? Any advice?? Thanks

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Disconnect both controllers. Put the one that works ok on the wiring supply to the one that isn't working. If it does not work you have a wiring problem. If it does work then the controller is faulty. This wiring is 12volt low amps by the way. When connecting the wiring can go either way on to the back of the controller. Don't let the two wires touch if the power is on to the heater, this can blow the circuit board on some older models.

Posted on Aug 20, 2010

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Posted on Jan 02, 2017

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I am trying to increase the temperature on the controller and it wont change. I have installed a new one and it still will not increase


[PDF]Operation / Installation Manual - Rinnai

https://www.rinnai.us/.../V_Series_Indoor_25xx_U...

Rinnai America Corp.temperature (shown on the digital remote control) the gas burner will ... Without the connection of a remote controller(s), the Rinnai Water Heater is preset to.

PDF]Tankless Water Heater Service Manual - Rinnai

https://www.rinnai.us/.../100000098_Rev_B.pdf

Rinnai America Corp.Indicates condensing water heater models. ... Rinnai Water Heater Service Manual. 2 ..... Digital manometer or U tube type manometer with 14 inch water column (W.C.) scale, a hose and two .... will flash on the display of the remote controller.

Nov 23, 2015 | Rinnai Digital Remote Water Heater Control...

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Get hot water from your Rheem tankless during a code 76 error


This doesn't always work, but on the Rheem tankless Gas/Propane water heater, if you're experiencing a code 76 error; disconnect the remote control unit (either from the water heater or the remote) by lifting the wires for the remote connection. Typically you'll get a C1-C8 error code, followed by a code 76; if you're getting a straight code 76 and nothing else, this procedure probably won't work.
Code 76 is a total power supply failure on the printed circuit board (PCB) assembly, which is the communication/power supply for the remote control unit. But, if you're getting a supplemental code (C1-C8) this procedure will most likely supply you with hot water until the replacement PCB arrives.

on Dec 01, 2009 | Rheem Tankless water heater for 1-2...

1 Answer

Controller has no lights or display after power outage.


Depending on the installation location, there may be a fused disconnect near the unit. Check for voltage there. If you have power at the disconnect, open the cover on the unit and check for power at the connection point.

Aug 21, 2015 | Rinnai Water Heaters

1 Answer

I have a AO Smith GPS 75 200. The power is on, however the temp control does not light up and nothing is working. Is the White Roger thermostat gas valve shot, is there some test I could do to make sure...


You have AO Smith tank-type power vent water heater with FVIR flame arrestor.
1) I believe this system has White Rodgers intellivent gas valve, with led indicator lights.
To test if valve is operational:
-NORMAL operating mode displays no lights on gas valve.
-Unplug unit from electrical outlet and plug back in. All lights on gas control should display for 1-5 seconds.
-Press BOTH Hotter and Colder temperature buttons for one second to 'wake up' the control, and release buttons and LED will display temperature.
-Press Hotter or Colder and see if any indicator light shows on gas valve.
This will give baseline if gas valve is functioning.
-Intellivent gas valve requires outlet that is wired 100% correctly. Test outlet with circuit analyzer.
-Water heater must be properly grounded for intellivent to operate.

2) Open following link to identify gas valve and download possible service manual with error codes and testing procedure. Service manual is a large file and will probably not load on dial-up.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#intelli

3) Open following link for AO Smith manuals and service handbooks.
Shows same intellivent service manual, and shows manuals for power vent, but does not specifically list the GPS75 series
http://www.hotwater.com/resources/product-literature/service-handbooks/

4) Take a moment and rate answer:
And 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.

Sep 08, 2011 | Water Heaters

1 Answer

How do I turn it on? I press the "on" button and


The manual says:
http://www.coinwash.com/temp/rinnai.pdf

"For the name of the Authorized Distributor or Installer nearest you, please contact your local HVAC dealer or gas service technician, visit the Rinnai website (www.rinnai.us), call Rinnai at1-800-621-9419 or write to Rinnai, 103 International Drive, Peachtree City, Georgia 30269"

Manual says that the remote is for setting temperature.
When you turn on hot water spigot, tankless water heater will heat the water to the set point temperature.
If water heater is not set up to use remote, then tankless unit will heat to 140 degrees F.
"With the MCC-45-4US remote control installed the water temperature is adjustable from 96
to 180°F. The water temperature cannot be set to a temperature other than 140°F
without the use of the MCC-45-4US remote control unit. If you require a temperature
other than 140°F you must install the MCC-45-4US remote control unit."

"Error messages are displayed on the remote control units, simplifying service calls."

Page 9 of manual shows hot to set temperature using remote.
Water taps must be shut off to set temperature.
Circulating pump must be turned off.
"Simply press the H or C button until desired temperature is displayed"
"green in-use indicator will display"

If your unit is not working, the manual says to contact local plumber.
Fixya has specialists who will talk to you by phone about your problem for a fee.

Dec 18, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

I have a richmond tankless water heater RMTG-74PVN-2 . the unit works most of the time but code c-2 comes up on the display and the unit shuts down. I shut the power off to reset this does not fix the...


I have a Richmond tankless water heater PTG2-42PVN. It will work for a very short time & then I get an error code of either C4 or C7. The remote control alternately flashes IL - 120

May 16, 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...

3 Answers

Code C7 76 falshes


I had the same problem. Rheem/Paloma tech support 1-800-431-1549 checked the error codes and sent me a new motherboard next day air. Since I stil needed hot water, I disconnected the remote control from the heater and it worked fine (just turn power off on remote, open front door of unit and unscreww/disconnect the 2 wires coming from the remote). The motherboard arrived and I installed and it works fine. However, you will need 1 person working on unit and one reading the codes/numbers on the remote (my unit is outdoors and the remote display is indoors, so it was not a 1-person job). Tech support was very helpful.

Oct 02, 2009 | Rheem Tankless Hot Water Heater...

2 Answers

My Rheem Tankless Hot Water Heater is installed, but is it not attempting to start. The digital display keeps blinking 82, 0, 82 , 0 ...?


If this is a new board and Altidude chip with power on set dip switch 1 and 2 to on. Then press and hold adjust button until on board blinks fast then and you will see dashes on LCD display. Set dip switches 1 and 2 back to off. Turn on remote unit and you should see 100F. With any luck you are good to go.

May 02, 2009 | Rheem Tankless Hot Water Heater...

2 Answers

How to correct error code C-7 on my RTG-74PVN Rheem Pronto


I had the same problem and called the manufacturer. The error code C-8 was followed by the number 76. They told me to disconnect the thermostat/digital display from the main unit. This was fairly simple to do by removing the front panel. The unit works steady now without shutting down after a few minutes. The help desk told me that the main circuit board needs to be replaced for the unit to work with the display and that they would mail me one asap. At least we have hot water again.

Oakville, Ontario

Jan 11, 2009 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

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