I just got back to a remote summer home that has been completely powered down since last October. A heat pump runs an all-electric heating and A/C system. It ran for about 5 minutes after powering up and then stopped. It eventually came on once more by itself for a few more minutes and that was the end. It's VERY expensive and complicated to get a tech out here.
Last summer the A/C gave out and a friend suggested I replace the circuit board and capacitor. I did that and everything worked fine. The relay is a bit rusty, but when I press it the fan comes on. A friend helped me check the freon/coolant and that was fine.
The lights on the thermostat indicating that the heat or A/C would be on are now off, but were on correctly when the system ran for the few minutes.
Where should I look next? Are there any more "simple" parts that anyone would suggest as a possible fix? The circuit board and capacitor both look very good (unlike the old ones last year) but I have no way to test them.