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I have a rinnai continuum 2520 that runs out of hot water while taking a 10 minute show. What could be the problem.

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SOURCE: I had a MC-91 US

I would suggest that you turn temperature setting up to 140 degrees and see if this won't help you. Obviously with water temperature that high make sure no little ones are left unattendded. Thank you

Posted on Nov 23, 2010

  • 1 Answer

SOURCE: I have a rinnai infinity

flow metering device is causing the heater to shut down until the temp changes enough u must adjust it on the heater refer to instillation manual or call rinnai

Posted on Mar 15, 2011

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I agree with you. The foam insulation should only be on the Hot Water side. The cold water side doesn't make any difference, as that temperature rarely changes in California.

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We have a brand new Rinnai gas heater, Avenger 25. The first two times we operated it, it was fine, but since then a code 13 comes up after 3-4 minutes and the heater turns off. Rinnai said we could...


These are the possible issues with the unit, based on the code list and description

Check that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue outlet.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure proper Rinnai venting material was installed.
Ensure condensation collar was installed properly.
Ensure vent length is within limits.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Disconnect keypad.
Disconnect EZConnect™ or MSA controls to isolate the problem.
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Check flame rod for carbon build-up.
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Check for DC shorts at components.
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Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Check for bleed over. Isolate unit from building by turning off hot water line to building.
Isolate the circulating system if present. Open your pressure relief valve; if unit fires, there is bleed over in your plumbing.
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Measure the resistance of the water flow control sensor.
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In case of a problem or clarification or my solution was insufficient, don't hesitate to post me a reply.

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May 31, 2011 | Air Conditioners

1 Answer

I have a rinnai infinity series 24 litre hot water system and the problem is that the water sometimes goes cold for 1 or 2 minutes whilst showering ! Why is this happening ?


flow metering device is causing the heater to shut down until the temp changes enough u must adjust it on the heater refer to instillation manual or call rinnai

Mar 15, 2011 | Rinnai Air Conditioners

2 Answers

We have an rinnia infinity 26 instant gas hot water system which has just recently installed (2months ago). It started working fine but started to produce hot water for five minutes until today it has...


This is operated by a flow switch, when you open a hot water faucet it turns on. There is a small filter in the cold water inlet on the Rinnai located just below the cabinet on the cold water line. It will unscrew and you can clean it out after you shut off the water to the unit. Make sure there is flow through the cold water line and out the hot water line. If that gets you nowhere, you will need to connect an MC control to the unit to get the error codes. Make sure you have flow through the unit and the gas is turned on to it. You will be able to hear it trying to start as an assistant turns on the hot water while you are in front of the unit and cover off. Look through the small viewing port for any spark or flame and see if it stays on or quickly goes out. You can remove the ingiter flame rod assembly and clean off any debris stuck to it with a soft brush. Not much you can do to it. It's like a newer car, you will need a technician with proper tools and experience with these units to be able to repair it. Your installer should cover this under their warranty and any parts needed will be under Rinnai warranty.

Feb 18, 2011 | Air Conditioners

1 Answer

Rinnai infinity standing in the shower and it suddenly goes cold for a few seconds no other water been run in the house or it goes cold and goes to a trickle then comes on again. Could the heat ex changer...


We are a bit confused by the device that you are using to heat the Hot water with- Is it an instantaneous HW heater?--
They are pressure sensitive-- Could it be, that your water pressure drops momentarily, (which causes the instantaneous heater to shut down its flame-- and you get a pulse of Cold water.)

If your hot water is a tank-- It is possible that something is cycling your hot water away-- like rinse pulses on the Washing machine)-- or your dishwasher?

Tell us more about the Rinnal Air Conditioners and what they have to do with Hot water and your SHower?

Tell us more-

Mack B

Jan 23, 2011 | Rinnai Air Conditioners

1 Answer

I had a MC-91 US Rinnai tankless water heater installed in my home last Monday a week ago today. The temperature is set at 120 degreres. The problem is when we take a bath. The hot water only lasts till...


I would suggest that you turn temperature setting up to 140 degrees and see if this won't help you. Obviously with water temperature that high make sure no little ones are left unattendded. Thank you

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We have Rinnai 18 instant hot water service. We have no hot water. Pilot light appears to have gone out. When I turn on hot water tap the temperature on key pad flashes at 19 degrees instead of 55


We have the same problem! It's happened twice this week after heavy rain. There is no error code "19"listed in the manual. Ours is a Rinnai Infinity 24 hot water service. I called Rinnai and they had no idea and were going to send a serviceman when it suddenly righted itself. Now it's recurred. Wife and daughters furious. Please help!

Jun 11, 2010 | Air Conditioners

1 Answer

We have installed a rinnai water heater in the basement. Since it takes a little time before the hot water arrives in the kitchen or upstairs in the shower, we are wasting qite a bit of potable water every...


The only way to reduce water waste would be to have a plumber install smaller pipes coming from the water heater to each individual point of use. The normal way of plumbing a house uses a large pipe that has smaller pipes that go to each sink, tub, shower, etc. The larger the pipe, the more water is in it and the longer it will take to get hot water to where it is going. An electric tank won't save you from wasting any water unless you have a separate hot water circulation system installed. This would keep the hot water drawn out to the far ends of the plumbing system and allow the hot water to reach it's destination alot sooner. However, keeping a tank full of water hot is not economical and a circulation system basically turns your pipes into a radiator causing you to waste electricity. I know it may seem that you are wasting alot of water waiting for the hot water to get there, but in the long run you and the environment are coming out ahead due to the saved energy and efficiency of the Rinnai unit. Also just in case you were thinking of it, a circulating system is not compatible with a Rinnai water heater.

Jun 19, 2008 | Rinnai Air Conditioners

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