This question is related to a previous question of mine about what seemed to be a voltage drop after a night of heavy snowfall.
A couple of weeks ago, heavy snowfall resulted in what appeared to be a voltage drop in my house. I am no expert (so excuse my probable lack of correct use of terms), but I believe one out of three electrical phases was dead / missing (that's what my electrician tells me). Looking at my fuse box I could see that it reported ~115v and not ~230v as it should. This caused a variety of "interesting" results on our electrical equipment.
One piece of equipment which just acted in a not normal fashion was our heat pump. When I woke up the morning, the heat pump did not run (but it's lights were on indicating power).
After the power came back, and ever since, the heat pump has acted somewhat strange. It reports errors and simply just works irregularly (runs for some time, suddenly stops, goes through defrost cycle even though there are 5C - 10C degrees outside). I contacted a service company which told me that one or two of the heat pump PCB's most likely had been damaged and most likely needed to be replaced.
Is it plausible that the recent incident have caused damage to our heat pump, but only to some extent? Or is this simply a coincidence which is a result of "wear and tear"?
How can a reduced amount of power able to result in damage to a heat pump which results in irregular behavior? We are after all talking about reduced voltage, and not increased voltage.