Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

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I have a bosch aqua star aq125-hx natural gas. I'm having a problem with it "lighting". Sometimes it works on the first try, sometime 3-4 times.I've cleaned the in-take screen. The unit doesn,t have a standing pilot or electronic. It starts on water pressure and I belive mine is around 50psi

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KenjiFox
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SOURCE: bosch aquastar Aq125-hx does not

That particular tankless water heater has hydro-generated ignition. In order for it to function, it requires a certain water pressure and velocity. You can try turning on the hot water in two location in your house to see if that gets it started. If it does, try getting a higher flow shower head, or removing the limiters in your faucets.

Posted on Jan 07, 2011

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Bosch Aquastar 125B Repair Parts Selection Grid

This web site has Aquastar 125B parts. It appears your unit was manufactured 7/7/02, so that is what I pulled up for you. At least this will be a start for you to locate the part. I hope these links work.






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Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Resources at Bosch
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx
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http://waterheatertimer.org/pdf/Bosch-aquastar-170vp-manual.pdf

All tankless and tank-type gas water heaters require regular cleaning and maintenance.
It is unknown if your unit needs maintenance or repair parts, but catching up on maintenance using information from manual is good place to start.
Gas appliances are increasingly complicated and experienced technician is good resource to have in local area before installing tankless.

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You have to fix this leak around the water valve before
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1. Close the water supply valve going to your tankless
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2. Unplug or close the natural gas valve.
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5.

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