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

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Pilot light goes out randomly on 6 year old Bosch Aquastar tankless water heater. When I restart it it may work for a day then goes out again.

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The pilot light can be blown out just by the main gas being ignited especially if the pilot flame is a little weak. Some times a bit of grit gets into the pilot nozzle reducing the flow and hence a weak flame. Try cleaning the piolt jet nozzle with a fine piece of wire. You may have to dismantle the jet nozzle to clean it properly.

Posted on Aug 31, 2010

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