Bosch Hydropower H10 not lighting

Discussion in 'Tankless Water Heater Forum' started by RobertB, Jan 8, 2020.

  1. RobertB

    RobertB New Member

    Jan 8, 2020
    Perth, WA
    Hello everyone,
    The model number is TF250. The main burner doesn't lightup. It does spark and there is pilot flame. But the red and green LED lights are not on.
    The pilot and main solenoid valves are working, I have tested them with battery. There is no voltage on main valve when I turn hot water on. So I thought the electronic ignition unit is faulty and replaced it. Bt it didn't help. The hydrogenerator produces 3.6V AC anstead of some 1.5-2V DC, is this normal? Could it be the ionization electrode? It looks like brand new and clean. Unit is only 2.5 yrs old and used very little, just one person in the house.
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