Question about Bosch AquaStar Natural Gas Tankless Water Heater #125B-NG
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Posted on Jan 02, 2017
SOURCE: I have a Bosch 125x
That sounds like there is dirt in the pilot orfice... that can be very hard to get out and even harder to clean....the hole is like smaller then a pin hole...
Posted on Nov 25, 2010
SOURCE: Water is way too hot.
Before calling service technician who has service manual and can test which part has failed, open following links for troubleshooting resources including steps below and phone number for Bosch:
Clean inlet filter
Check all faucets for clear pathway
This unit does not work with preheated water (solar assisted)
Incoming water above 70 degrees, avoid restricted faucets
Check that both temperature sensors are making contact and firmly mounted on respective cold and hot pipes.
Descale heat exchanger
Posted on Aug 16, 2011
There are service bulletins concerning water valve rebuild and water valve retrofit that may be useful:
From retrofit service bulletin:Old brass valve is replaced with improved plastic water valve.
Two sets of screws hold water valve against gas valve.
Descale water valve with CLR if it will not remove easily.
Call 800-642-3111 for help
Fix most tankless water heater problems yourself, same day for about $350.
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Posted on Sep 04, 2011
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