Question about Bosch AquaStar 125FXKIT-LP 125FX Liquid Propane Gas Tankless Water Heater w/ Hood
Bosch AQ 125 FX LP model
Sometimes it lights correctly, but usually the fan doesn't start, piezo ignites the burner and burns until over-temp switch shuts off gas. Replaced the control unit, but I still have original problem. If the fan does start it runs fine for about 10 to 15 seconds, then shuts off. Other times nothing happens, no fan, no piezo, no ignition. I use a whole house pre-filter, don't have hard water issues and have never found any debris in intake filter. Any suggestions? I've already spent almost 40% of the original cost on parts for a 7 year old unit. It has been flawless until the last 3 weeks.
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Posted on Jan 02, 2017
First Clean the ignitor assembly and make sure the flame is reaching the flame sensor strongly.
You may need to replace the flame sensor.
Posted on Dec 06, 2008
Actually this sounds more like a bad ECO on the outgoing hotwater pipe. Disconnect it and ohm it out for about .5 ohms with a digital multimeter.
Posted on Jan 19, 2009
there is a small dia copper pipe which has a thermal coupling on it the end of it sits in the flame of the pilot light,
if it fails which it does after about 25-15 months,it shuts down the gas burner
Posted on Jul 05, 2010
Natural Gas: Pilot burner or orfice may need to be cleaned. Pg 11 manual.
Most tank and tankless gas water heaters today suggest annual cleaning and maintenance of burner.
Open following links for Bosch troubleshooting resources:
Posted on Jun 14, 2011
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