Question about Bosch AquaStar 2400ES-NG

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Whistling Bosch AquaStar 2400ES-NG

I have a Bosch AquaStar 2400ES-NG and the unit after finally getting it installed correctly whistles from time to time. How do I stop the whistling which my neighbors can hear.

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I know that this is a very late response but others may be searching for a solution. I actually fixed this problem myself. The whistle coming from my unit could be heard around the neighborhood.
All of the checking for technical issues around valves, tubing, gas pressure, etc. yielded nothing.
Turns out that all that was necessary was lubricating the squirrel cage fan. I used a spray lithium grease - one squirt. Instant fix. It has been a year now and the whistle has not returned.

Posted on May 16, 2016

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If you have incorrect gas line size when it kicks on the lack of gas pressure to the unit will cause a wistling. make sure you have enough gas to the unit

Posted on Jul 29, 2009

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1 Answer

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1) Live answer Feb 2013:
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf

2) Call Bosch
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3) Call service technician.

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http://waterheatertimer.org/How-to-install-gas-water-heater.html

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