Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125
Cleaned out the pipes got a nice flame but still won't heat the water
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Posted on Jan 02, 2017
SOURCE: Bosch AQ125BNG gas water heater
First thing I would do is clean and rebuild the watervalve. The watervalve on this heater mandates everything. This watervalve has a maintenance schedule in the manual. She be rebuilt every 3 years. Also sounds like the diaphram in the watervalve may be damaged.
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
Tankless heaters do not like back pressure from anti scalding devices in shower controls. Every time they compensate and shove more coldwater to the hot side so you don't get burned when someon is using the cold water elsewhere in the home, it can reduce the heater below it's minimum flow rate and shut it down. Nothing wrong with the heater. Ask kohler if there is a wy to disable the device without buying a new unit entirely.
Posted on Jul 26, 2010
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