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Author Topic: High Pitch Noise from Water Heater  (Read 212 times)

keith c

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High Pitch Noise from Water Heater
« on: August 22, 2017, 11:57:27 AM »
I recently noticed that there is a high pitched noise coming from my water heater.  I have an Atwood 6 Gal. water heater.  The noise disappears when the water heater is turned off and reappears when the water heater is on  (both electric or propane).  The water heater functions normally.  The water gets hot on both electric and propane.  There are no leaks.  I've had the circuit board swapped out, but still the noise persists.  Does anyone know what could be creating the noise? 
Keith C
2017 Ford F150 3.5L Ecoboost w/ Max Trailer Tow
2013 Jayco Eagle 304BHS
320 Watts of Solar
Michigan

massspike

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  • Posts: 109
Re: High Pitch Noise from Water Heater
« Reply #1 on: August 22, 2017, 12:08:30 PM »
I have the same issue (same heater). A part near the internal vent starts vibrating when the heater comes on. Dealer couldn't fix it without taking it apart and since it is only noticeable when standing close to it outside the trailer I decided to put it in the annoyance folder. If you feel around just after firing up the heater (before it gets hot) you may be able to bend it into silence.

Wizard46

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Re: High Pitch Noise from Water Heater
« Reply #2 on: August 23, 2017, 08:06:22 AM »
Sounds like you may have a check valve on the inlet or outlet malfunctioning. Sometimes you can tap them to free them up. Usually you have to replace them or at least remove the guts and reinstall.
Jerry & Patsy Potter, Taz & Jake Jr.
2000 Winnebago Journey
2006 Ford Explorer 4X4
Home: Milledgeville Ga.

keith c

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Re: High Pitch Noise from Water Heater
« Reply #3 on: August 23, 2017, 10:04:00 AM »
Jerry, if it was the check valve, why would the noise occur as soon as the water heater was turned on and disappear as soon as the water heater was turned off?  Wouldn't the noise persist until the water cooled down if it was the check valve?  Thanks
Keith C
2017 Ford F150 3.5L Ecoboost w/ Max Trailer Tow
2013 Jayco Eagle 304BHS
320 Watts of Solar
Michigan

Gary RV_Wizard

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Re: High Pitch Noise from Water Heater
« Reply #4 on: August 24, 2017, 12:34:30 PM »
Quote
Wouldn't the noise persist until the water cooled down if it was the check valve?

One would think so.

I've heard of a heater that sang whenever the heating element was active. The water immediately around the element boils and bubbles, and in rare cases that tiny noise can reverberate. The fix (I'm told) is to change the tank or piping a tiny bit to stop alter the vibration so that it is outside the audible range. Maybe just a shim somewhere, or flex a water line to a slightly different position?

I would also flush the heater tank and re-establish the air head, just to make sure everything was in peak operating condition.
« Last Edit: August 24, 2017, 12:37:08 PM by Gary RV_Wizard »
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

keith c

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Re: High Pitch Noise from Water Heater
« Reply #5 on: August 24, 2017, 12:53:47 PM »
Thanks Gary.  I've flushed the tank at least 2X this year and no change. I am not familiar with re-establishing the air head.  What do you mean by that?  Thanks.
Keith C
2017 Ford F150 3.5L Ecoboost w/ Max Trailer Tow
2013 Jayco Eagle 304BHS
320 Watts of Solar
Michigan

Wizard46

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  • Posts: 2020
Re: High Pitch Noise from Water Heater
« Reply #6 on: August 25, 2017, 08:02:28 AM »
Yes, that is strange, when it was my check valve, that was when I turned on any faucet and water flowed that I would hear the noise. To reestablish the head, drain the heater, close the drain back up and refill by opening a faucet.
Jerry & Patsy Potter, Taz & Jake Jr.
2000 Winnebago Journey
2006 Ford Explorer 4X4
Home: Milledgeville Ga.

kdbgoat

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Re: High Pitch Noise from Water Heater
« Reply #7 on: August 25, 2017, 08:46:50 AM »
Or shut the freshwater feed to the RV, or turn off the pump, open the pressure relief valve and then close it when water quits coming out.
I know you believe you understand what you think I said,
But I am not sure you realize what you heard is not what I meant


2016 Leprechaun 319DS

Gary RV_Wizard

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Re: High Pitch Noise from Water Heater
« Reply #8 on: August 25, 2017, 09:13:12 AM »
The "air head" is a cushion of air inside the heater, above the water. The water level in the tank should be roughly at the height of the PTR valve; the rest should be air.

Procedure for re-establishing the air head is as others dscribed, or see RVForum Library article at http://www.rvforum.net/joomla/index.php?option=com_content&view=article&id=105:hot-water-pressure-relief-valve-leaks&catid=42&Itemid=132
« Last Edit: August 25, 2017, 09:17:25 AM by Gary RV_Wizard »
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

 

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