Question about Rinnai MC-91-1US-S-RK Integrated Controller Relocation Kit for Tankle

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Need to find controller relocation kit for REU-KB3237FFUD-US

The Rinnai MC-91-1US-S-RK does not fit the REU-KB3237FFUD-US (RU98i type) water heater. Does anyone know the correct relocation kit for the REU-KB3237FFUD-US (RU98i type) water heater?

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Posted on Jan 02, 2017

gary1121
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SOURCE: Rinnai *85e remote hooked up no hot water and no reading on remot

did you turn the unit off before hooking it up ? Any function on a tankless rennai the pwer has to be turned off and the priority button has to be pushed in,, if you have the manuel it tells you haw to do this,,

Posted on Jun 06, 2009

senor8
  • 73 Answers

SOURCE: need to wire a zone control for a closed system with a circulator

Tankless water heaters for domestic use fire whenever there is water flow. As long as the pump flow rate exceeds the minimum flow rate of the appliance, the heaters hould fire (the return temperature needs to be less than the set temperature as well). Boiler systems will typically require a thermostatic signal (call for heat) and water flow before they will fire. Tankless heaters are designed for residential use and only require pump flow to fire.

Posted on Aug 18, 2009

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SOURCE: need instruction how to flush Rinnai tanklees hot water heater

Found this link on how to do it:

Hope it helps.

Posted on May 07, 2010

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SOURCE: Dip switch settings for Rinnai V1200 & V1500

curios to find out if you had any help on this subjuct at all?

Posted on Aug 01, 2010

  • 120 Answers

SOURCE: Ignition problem: I have a gas

This is an error code 12, not 12 degrees. You have a short on your low voltage side by the sounds of it.. First disconnect the controllers inside the heater. Turn of the power first, 2 screws top and bottom to take the frnot panel off. Follow the low voltage wires (not the power point ones) to the PCB on the ride side and disconnect them both. Panel back on, power on and try the heater again. If this fixes it you have a short circuit in the controller or the wires leading to it. If not the most likely short circuit is on the thermal fuse which loops around the heat exchanger. This will need an expert, Perth has plenty north and south of the river. Give Rinnai a ring first, they have some good staff in Perth who might help.

Posted on Dec 14, 2010

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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...

1 Answer

Water does not stay hot


Had this trouble with a condensing boiler,water pressure was too low, also if thereis an adjustable stat try turning this up ?

Jan 26, 2013 | Rinnai RU98i-N Interior Natural Gas...

1 Answer

What does code 79 mean for the rinnai RU98i? It is beeiping and flashing 79


There is water leakage internally. Possible tank or water inlet or water entering from the combo air inlet/exhaust pipe.

Jan 09, 2013 | Rinnai Water Heaters

1 Answer

I have a Rinnai Model 2532 with an MC-45-4US and BC-45-4US control units. I finished another bathroom and want to add a controller, but have been told that a compatible BSC-45-4US is no longer made. Is...


Sorry Ken I worked for Rinnai Australia as a service manager so treat my advice with a little cuation but you should find the basic universal controller should work fine. The code over here is a MC-91 Q2A. It will MC-91 sometihing for over there (I'm guessing from the codes you use you are across the pacific!). You can wire this unit either back to the heater or to wiring from another controller, just match the colours and link them in. Power off the heater first but it is all low voltage.

May 26, 2011 | Rinnai Digital Remote Water Heater Control...

1 Answer

Im looking for the best option to get a Rinnai unit that would supply water at 30c or just below. i was going to buy the REU 55RT but looking at the manual i dont know how low the temp can get


Most tankless are preset to 120 degrees F.
30 degrees C is 86 degrees F.

If you want adjustable product, then tankless is not best choice.
Tankless are high tech gadgets with multiple interrelated parts controlled by sensors feeding information to control board. Everything internal and external has to be working correctly for tankless to work at all.
Most tankless brands do not suggest self-install, or self-adjustment, or any adjustment for reason given above.
You would be better off buying typical tank-type gas or electric and then thermostat adjustment is simple.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
http://waterheatertimer.org/pro-n-con.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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.

Mar 23, 2011 | Rinnai Digital Remote Water Heater Control...

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.

Jan 31, 2011 | Rinnai Digital Remote Water Heater Control...

1 Answer

Ignition problem: I have a gas hot water system: RINNAI CORPORATION; MODEL:REU-2008W-A the panel display temperature as 40C, when open the tap, the temperature display dropped to 12C, and no...


This is an error code 12, not 12 degrees. You have a short on your low voltage side by the sounds of it.. First disconnect the controllers inside the heater. Turn of the power first, 2 screws top and bottom to take the frnot panel off. Follow the low voltage wires (not the power point ones) to the PCB on the ride side and disconnect them both. Panel back on, power on and try the heater again. If this fixes it you have a short circuit in the controller or the wires leading to it. If not the most likely short circuit is on the thermal fuse which loops around the heat exchanger. This will need an expert, Perth has plenty north and south of the river. Give Rinnai a ring first, they have some good staff in Perth who might help.

Dec 02, 2010 | Rinnai Water Heaters

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