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Vitodens 100W Power Pump Module Failure
Comments
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The fan and boiler are now operational!
The high voltage capacitors, optoisolators, gate drivers, offline switch and transistors were replaced in the fan.
I believe the problem originated with a shorted MOSFET in the fan that caused a power surge. The surge in turn damaged another component(s) on the fan board, blew the fuse on the control board and damaged 2 resistors on the power board.
I want to thank @GGross and especially @109A_5 for their assistance in the repair.
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Hello @Beaver33,
Excellent news !!! You have gone where few go and WON !!!
Possibly the cause of the original failure, but I have my doubts. It seems like an input power over-voltage situation to me. With the original shorted MOSFET not blowing the internal (to the motor assembly) 2 Amp fuse I doubt any reactive surge would do that type of damage to the resistors.Beaver33 said:I believe the problem originated with a shorted MOSFET in the fan that caused a power surge.
I would suspect Lightning, power utility antics, or a service entrance neutral wire issue.
I think I would put a good quality surge suppressor on the boiler's branch circuit. Or your own MOVs in a metal box. Metal box for MOVs they are known to start fires. It may be cheap insurance to avoid a repeat performance.
Anyway good to hear you are up and running, its getting cold out (at least here), with any luck it will never happen again.
National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System0
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