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Rinnai infinity hot water service, goes hot and cold...not fun in the shower!

Hi I have moved into a rental property and it has one of the rinnai hot water things now I have a control in the kitchen and one in the bathroom, i set the water to 38 and jump in the shower it is nice and toasty then after a minute or so it goes cold then warms up again then goes cold again constantly until I give up and get out totally annoyed. Neither the kitchen or the shower holds a consistent heat, thought I would see if anyone knew anything about these things as the estate agent seems to have no idea at all and I really want a nice hot shower! Thanks heaps!

Posted by kim29 on

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We had the same problem - the hot water would only be hot for 3 -5 minutes and shut off, then we had to turn the water off, wait a few minutes, and do it again. VERY FRUSTRATING.

Solution: The Rinnai serviceman showed me the heat-exchanger blower/fan: It was clogged with dust and moths.

Another clue: Our Rinnai was extremely noisy when the heat came on. After the fan was cleaned and replaced, it is nearly silent.

If you are reasonably machanically inclined:
TURN THE BREAKER / POWER OFF to the unit.

The blower-fan is located in the lower central area of the unit (at least on our unit). If you draw imaginary north-south, east-west lines through the center of the unit, the fan is in the lower-left quadrant. There is a spring clamp securing the black rubber accordian-like tube to the fan. There are two screws that secure the fan to the unit. there are two plugs that connect to the fan, as well as a third air-flow sensor that should be removed. then you can look at the fan unit, as well as the grill on the underside of the heat-exchanger that should be cleaned.

My thought was to go out and get a simple bug-screen, and place it over the air-input outlet vent going outside, but the repair guy said that although it may sound good, if that screen ever gets clogged, or reduces airflow to the Rinnai, then the unit will work harder, or even shut off, giving the same problem,

Posted on May 07, 2010

  • Anonymous Feb 12, 2013

    that fixed my problem, followed your directions and cleaned out my fan. thank you jim

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Hightemp needs set and mix valve needs reset- it is adjustable- find book

Posted on Nov 02, 2008

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My water temp keeps going up and down in the shower

Posted on Jan 19, 2010

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My rinnai infinity water system is not firing up

Posted on Nov 16, 2009

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Go to the controller, if you can find book go to the page that shows the controller and check the water flow comming thru the water heater, if waterflow is falling below .06water heater is shuting down. Your water pressure may be to low.

Posted on Jan 13, 2009

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We had the same issues. Couldn't even run a bath.

We found that the dip switchs weren't set correctly for our ELEVATION during install.

We have a Rinnai r75lsi. Refer to user manual page 34 for correct switches per elevation levels.
We changed ours to our correct elevation and have been running consistent hot water since. Hope this helps.

Posted on Apr 05, 2013

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