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Posted on Mar 09, 2009
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My r85 rinnai water heater vibrates significantly and makes

Loud noises while under heavy water demand

  • dssmith1370 Apr 07, 2009

    My water heater vibrates under use it sounds like the house is falling down
    I have a water softener hooked up some tell me it lime or scale how do I clean it


  • happyras May 21, 2009

    One typical solution is to reduce the house water line pressure which should be reduced anyway by a pressure regulator. I set mine to 60 psi and still have an occasional issue with vibrations, resonance, however it is reduced.

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I just had this exact problem. It kept getting worse until we had no water. Our Rinnai tankless hot water heater started the same way though, with hot water for a few minutes and then would shut off with an error code 10. We just had to shut the hot water off and then back on, wait a minute or so and we had hot water back for a few minutes. Our unit would come on with a loud vibrating noise and remain until it shut off with an error code 10 (air flow fault). The solution was to remove the blower fan and blow out the squirrel cage. Ours had moths in it. We also vacuumed out the fan housing. Be careful to mark any wires you disconnect and take pictures before removal. Our unit is now almost silent when it comes on and supplies endless hot water.

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  • Posted on Mar 15, 2009
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Sounds like there is something loose in the line.Like cut off valve,check valve.

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Rinnai r85 not firing up (but I have power to the controller) with no error codes

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R85 tankless water heater running cold.

possible bad power transformer or unit is overheating
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I have a Rinnai R85 water heater and my temperature controller doesn't have any power.

You will only get power out of the controller when there is a call for hot water. If you have power into the controller, and you still get no power out when there is a demand, then the controller is bad and must be replaced.
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Rinnai R85 starts to warm then stops and blinks 61??

I went to the Rinnai website and this is what I found for error code 61.
Error Code 61 Problem: Fan failure
Solution: Measure the resistance on the fan motor, check the damaged or loose wiring and connections. Make sure that the fan spins freely.
Sounds like either your fan is broken or something is keeping it from spinning freely.
Hope this helps.
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My rinnai on demand hot water heater sometimes makes rummbling noise when firing

It might need cleanning of exaust fan.or system flush of heat exchanger
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Lound vibration when running

Check gas control valve.

Good luck,

Marty
3helpful
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I have a Rinnai model R53-i-1. When hot is called for, heater turns on and produces a low to loud vibrating noise. It seems to change with water flow use at tap. I called Rinnai, got the name of local guy,...

A low to loud vibrating noise is an indication of an Air /Fuel imbalance . When you flow more water , does the noise become louder ? if so , have a service technician check for pproper incoming gas supply . The requirements are located on the left hand side of the Rinnai unit . There will be a minimum/maximum specification.
Another issue could be the burners being "dirty" and needing to be cleaned .
Also investigate the venting and make sure all joints are sealed properly and the venting is sloped correctly . If you have your installation manual , please refer to the venting section in regards to usage of a condensate collector . This can be a cause of noise .
There is a clear vinyl hose running from the bottom of the heat exchanger to the front of the gas valve . Please inspect this hose for any moisture or signs of staining . This can lead to issues with the gas valve . It must be determined where the moisture is coming from (See previous comment about Condensate collector !) .
The cold water solenoid valve usually has nothing to do with this type of noise .
As far as yourself being able to repair the unit ? I have no idea of your experience but a qualified licensed service technician should be used as this is a gas fired appliance and as such is subject to huge liabilities when being repaired .
Have them call Rinnai Tech Support while on site for any assistance needed.
You shouldn't have to "put upo " with any noise issues . The Rinnai ujnits run at 49 decibals (about the same level as a conversation .
Good Luck !
1helpful
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Loud noises

did you size the gas line properly? sometimes if the gas pipe isn't sized properly it will cause some pretty loud wistling noises. also if you have something in the fan like bugs or lots of dust it will cause alot of problems with noises
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