Bosch instant hot water heater GWH 1600 H - LP
no spark at pilot with full water flow
does not even spark. only sound is from water generator.
was installed 6 years ago by a gas technician
6.2 No spark at pilot with water flow
according to the manual gone through all steps, check wires. changes hydro generator, replaced diagram in water valve and control box.
still no spark with water flow. output on generator is 1.61 v
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Sounds like you have a hydro-generator on this unit. Check the output on the hydro-generator it should be about 1.5V DC. If not clean the inlet screen and check your water pressure. Water pressure less than 30 PSI will cause issues. If you have 1.2V-1.5V DC make sure the power switch is on. If the power switch is on replace the control unit. I sell parts for Bosch units only!
sounds like the generator has packed up. check water flow and clean any filters on the water line. you will need a service agent to check milli volts on generator and power pack
I have the same problem with the same model. The problem has been identified by a friend of mine, correctly, I think.
This is a very dangerous problem involving Bosch's much touted safety feature, ironically enough. IT IS THE FLAME SENSOR IN THE GAS VALVE. The flame sensor is supposed to confirm that the pilot has lighted BEFORE the main gas line sends gas to the main burners, after which the pilot shuts off. The pilot light is not coming on, the sensor that shouldn't let gas fto the main burners is failing and the main gas is flowing and ignighting from the spark that is supposed to light only the pilot in a big explosion.
This is the 2nd unit of this model that has failed. I think Bosch should do a recall
The manual says to hold a match near the pilot while the ignitor is
trying. It says that if the unit lights the pilot orifice may be dirty
or clogged. Then the manual says to check
the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.
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