Question about Rinnai Webstone The isolator EXP tankless water heater Service Valves WRIK
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.
Soution: 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 mechanically 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. Also - the Rinnai pipe going outside is a pipe within a pipe - so its both inlet and outlet air.
Posted on May 24, 2010
Gas pressure problem the unit needs to maintain 6.0 inwc on natural gas with an incoming pressure of 7.0inwc. If it does not have this pressure when running with high flow demends it groans and vibrates. U may need a bigger gas line or the meter pressure increased. The other cause may be something in the inducer wheel. But you should have a qualified rinnai service provider check it out not some local plumber or an installer unless they are trained and certified by Rinnai
Posted on Apr 02, 2010
It's not water hammer. It has something to do with the cold. Mine just started doing it tonight (it is -6F outside right now). If I turn it on slow and only about half way I can get hot water. If I turn it up all the way it vibrates really loud and quits.
Still looking for more information, but here is a link about the cold. http://blog.hoopycat.com/2008/03/the-rinnai-2520-a-few-years-later
Posted on Jan 08, 2010
I just fixed my rannai r75l that was vibrating. it turned out to be loose mounting screws on the fan. runs quietly now. easy fix.
Posted on Mar 19, 2013
You may have a mouse in the blower motor.or a mice nest,
Posted on Sep 27, 2010
Water hammer sounds to be the problem, install a water shock arestor in your water lines...should take care of your problem.
Posted on Nov 21, 2009
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Posted on Jan 02, 2017
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