Has anyone seen anything like this?
Earlier this week we had an ice storm that resulted in a five hour power outage. We have a backup generator that took over during the outage with no problem, but I then realized the house was beginning to cool down unexpectedly. When I checked the thermostat, it was dead meaning no 24VAC was getting to it. When I checked the other two thermostats, they too were dead. We have three furnaces, one for each level of the house.
After checking circuit breakers, etc. and finding that 110AC was getting to the furnace, I finally determined that the 110 ==> 24 transformer connected to the circuit board had been fried. AND THIS HAPPENED TO ALL THREE!! I replaced the transformers and all are again working fine, but I and several other friends, including one who used to own an HVAC business are all scratching our heads as to how this could have happened to all three. When the power went out, there didn't appear to be any surge, like lights brightening for a moment. The lights just went out.
Has anyone ever come across something like this? Thoughts?