Rinnai Water Controller Questions

Phil2mo · Water Controller

I have a Rinnai Infinity BSC-45-3A and need a installation manual and want to know if I can use it on a Rheem gas water heater.

Rinnai DM 1mo

Hi Phil, thanks for the question. We would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Regards, Rinnai Australia

Graham3mo · Water Controller Universal

Hi I'm installing a mc601qa controller and the cable is 10mtrs long and I only need 3 mtrs is it ok to shorten it.

Rinnai DM 3mo

Hi Graham,

Thank you for the question, we would recommend contacting our Technical team on 1300 555 545. (Option 3).

Kind regards, Rinnai

Brian M11mo · Water Controller

Hi I have a model Reu-2425W-A with temp controls and was wondering if I could use the controllers on a new B26 unit Cheers Brian

Rinnai DM 11mo

Hi Brian M,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Bob12mo · Water Controller

im replacing my rinnai 26 infinity with a rinnai 26 builders model will my old controllers work with that model or will i need another infinity

Rinnai DM 12mo

Hi Bob,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Middy2y · Water Controller

Hi. We have a Rinnai Infinity 24 (model REU-2425W-A) installed when the house was built in 2002. It works perfectly fine and is coupled with 3 controllers - a MC-33-3A in the kitchen and two MC-33-3A, one in each bathroom. We are renovating our ensuite and want to update the controllers without, if possible, replacing the entire set-up. Are the controllers MC-601Q, BC-100V-1A and MC-100V-1A compatible with our old Infinity 24 unit or will need to update that as well? Hope you can help Andrew

Rinnai DM 2y

Hi Middy,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

diny.fanggidae2y · Water Controller Universal

Is it safe to turn on and off every time we’re not using the hot water?

Rinnai DM 2y

Dear diny.fanggidae, Thanks for your question. Yes, it is safe to turn on and off your Universal Water Controller everytime we're not using the hot water. The Universal Water Controller is 12 Volt. For further information please refer to the Owner's Manual supplied with your Hot Water Unit.

Thanks, Rinnai Australia

Thanh2y · Water Controller

Hi I have Rinnai REU-A2626WB-AK-50 and I'm looking for compatible controller for it. Is it MC91Q2A or MC601Q? Thanks

Rinnai DM 2y

Hi Thanh,

We have sought advise from our Technical Helpdesk and we are advised that the MC601Q will be the compatible controller, and you will be able to source this through Reece Plumbing.

Regards, Rinnai Australia

Jason C.2y · Water Controller Deluxe Bathroom

i have a Rinnai 26 , about 17 yrs old . model REU-V2626W-AK . Will it work with the new Deluxe Bathroom control BC-100V-1A.

Rinnai DM 2y

Hi Jason C,

Thank you for your question.

Yes, will work with MC100V controller.

Thanks Rinnai Australia.

john2y · Water Controller

Hi we have a REU-2408W-A with MC-33-3A and BSC-45-3A and BC-45-3A wall controllers, Is there a replacement option for wall controllers these?

Rinnai DM 2y

Hi John,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Sean F.2y · Water Controller Universal

How do I turn it on?

Rinnai DM 2y

Hi Sean F, Thanks for the question. To turn the MC91Q2A Controller on press and hold the on/off button or refer to the owner's manual supplied with your Hot Water Unit. We would also recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Michael C.3y · Water Controller

I have a Rinnai infinity 24 one bathroom controller not working - Controller model no mc-91-1a can i replace

Rinnai DM 3y

Hi Michael C,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Josh C.3y · Water Controller

Hi, we are renovating bathrooms and I want to replace the 20+ year old hot water controllers. The current ones we have are MC-33-3A in the kitchen at the source, and BC-45-3A in the bathroom. What would be the modern direct replacements for these?

Rinnai DM 3y

Hi Josh, Many thanks for your question. You can visit our website or follow this link to see our current range of controllers: external link Our current controllers are not always compatible with older model hot water units. If you can provide us with the model number starting with REU, we can check the compatibility of the controllers with you unit.

You can also contact our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Josh C. 3y

Thank you for the prompt reply - it's greatly appreciated. The model number is REU-2020W-A

Rinnai DM 3y

Hi Josh, Many thanks for supply your model no. Our Deluxe Controllers, BC-100V & MC100V are listed as compatible. The wireless controller is also listed as compatible. With the BC-100V, the bath fill function may not work.

You can also contact our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks Rinnai Australia

Vinz3y · Water Controller Wireless

I have a Rinnai MC-502RC-1A-S wireless controller which will not increase my water temperature past 37d, and the display screen is not lit up as it used to be. I have changed the batteries, and all the indicators show up, but the display screen is dimmer when pressing the temperature button.

Rinnai DM 3y

Hi Vinz, Thanks for your question. The controller should adjust between 37c to50c/60c, if the display dropping out that is an original wireless remote, fatigue maybe an issue or the contacts where the battery is fitted may need to be cleaned. Otherwise, it will need a complete replacement MC503RC new transceiver and remote as the MC502RC is NLA Obsolete. You can purchase a replacement MC503RC transceiver and remote from any Rinnai Stockiest, please refer to the below link to locate your nearest store:

external link

Thanks, Rinnai Australia

Vinz 3y

Thanks for quick reply, I will replace it with a MC503RC. Thanks for your help

Rinnai DM 3y

Hi Vinz,

We are pleased to have assisted you in this matter.

Thanks, Rinnai Australia

Jeff C.3y · Water Controller

So, I have an older Rinnai electric hot water cylinder and it has an old electronic controller for the solar assist. The controller model appears to be an AIMS AC2 Baseline, but the solar assist part stopped working around the time our roof was restored and we had Solar installed. I have managed to read some documentation that describes the operation of the controller, but I cannot see how to TEST it to identify the issue. Is there a pump override that I can set to force the pump to work? Is there a specification of the Hot Sensor to test that? Under what conditions does the Hot sensor signal to the controller to turn on the pump? What is the signal - a short/open circuit or a change in resistance? Plugging/unplugging the hot sensor activates a relay within the controller but I cannot hear/feel the pump kick-in after approx 1 minute of waiting in either case and the pipes to the roof no longer get hot like they did when the solar assist was working.... Any help welcomed.

Rinnai DM 3y

Hi Jeff,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Sam S.3y · Water Controller Universal

Hi, I cant increase the temperature more than 43 degrees. The in use light is red and i dont have any leaking hot water taps.

Rinnai DM 3y

Hi Sam S, If the in use light is on water is running through the water service which means either a hot tap is on or water is leaking which will limit temperature adjustment to 43c unless flow can be turned off.

Whilst hot water outlets are open, the set temperature may be lowered to a minimum of 37c. For safety, it cannot then be raised above 43c until all hot water taps are closed.

If the water heater is turned "Off" whilst hot water taps are open it cannot be turned back ON until all hot water taps have been closed.

We would recommend contacting us to discuss this matter further. We can be reached on 1300 555 545.

Thanks

Rinnai Australia

Sue L.3y · Water Controller Universal

Hi, our Rinnai MC91Q controller has gone blank ,absolutely nothing on the display . Which also means no hot water . Do I need Technical support or is there a way to turn it back on ? Thanks Sue

Rinnai DM 3y

Hi Sue L, Thank you for your question.

We would recommend contacting the Rinnai 1st Care team on 1300 555 545 to be provided with technical assistance or book a service call. Thanks Rinnai Australia

Michael F.3y · Water Controller Universal

We have a Rinnai AquaMax20 continuous flow gas hot water system. We received cord and 2 x MC-91Q-2A with our unit but didn't have them connected when first installed. We have now tried to connect a universal control in the bathroom. The electrician has indicated power is reaching the controller but we are unable to get the controllers to work (we have tried both). We have tried pressing the 'on/off' button once, holding the 'on/off' button and the 'transfer' button simultaneously for 5 - 10 seconds and pressing and holding the 'on/off' button for 3 seconds as per the various instructions we received with our water heater without success. Are there additional steps required to activate the controller other than connect the wiring to the controller terminals in the water heater?

Rinnai DM 3y

Hi Michael F We recommend calling our Technical Helpdesk on 1300 555 545 opttion 3 and they can confirm the model of the unit you have as Rinnai Australia does not manufacture the Aquamax hot water units. If it is a Rinnai product, they may be able to troubleshoot the issue,

Thanks Rinnai Australia

David3y · Water Controller Universal

I have 2 controllers, they both show same temperature, cant have different temperatures, and now controllers keep reverting back to 40C all the time on their own? The heater and controllers about 12 years old?

Rinnai DM 3y

Hi David,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Peter4y · Water Controller Deluxe Bathroom

The bathroom controller is dead. I purchased a new unit and is also dead. Is there an adjustment in the rinnai 26 unit?

Rinnai DM 4y

Hi Peter,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

Katerina G.4y · Water Controller

Hi My Controller keeps turning off.It only started reacently .I put it back on and after a while turns off again.What could be causing this?

Rinnai DM 4y

Hi Katerina G,

Thanks for the question, we would recommend contacting our Technical Department to discuss this matter further. They can be reached on 1300 555 545 (option 3).

Thanks, Rinnai Australia

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