We have a Carrier Infinity, installed less than a year ago. EVERY time the power goes out, the unit shuts down for hours, sometimes a whole day. The display says "system malfunction." The error code is usually "contactor short." Yesterday it was "high pressure switch open." The contactor has been replaced twice, although it probably wasn't necessary either time, because by the time the tech got here, the unit was functioning again. He replaced it anyway, because of the error message, which seems logical, even though the unit was then fine. Today we had another thunderstorm and the power went out for a few seconds. The Carrier service rep told us this morning NOT to flip the circuit breaker, just to leave it, as to avoid a lockout. After waiting 4 hours, we decided to flip the circuit breaker anyway, since in the past, that is the only thing that seemed to reset the system. When we flipped the circuit back on, the error message was gone AND the unit came back on! This does not work right away, only after several hours, which is why I think there must be some internal lockout timer. Two techs have been out MANY times and can not duplicate any issue. If we just leave the system on when the power goes out, the fan stays on. The air is warm of course, so we end up turning the system off on the control panel. In addition, after we wait a while, we end up flipping the circuit breaker. The system then runs beautifully (after a 3 or 4 hour wait), until we have another thunderstorm. So, we have tried both just leaving it and waiting for it to reset on its own (like Carrier and the dealer said), and we have tried to "force" a reset by flipping the breaker. I do not think it is a contactor, unless it is possible that we need a stronger one, as one tech recommended. Is that likely? IS THERE AN INTERNAL LOCKOUT (other than the keypad lockout)? IF SO, HOW DO YOU RESET IT and WHAT WOULD CAUSE THE SYSTEM NOT TO RECOVER WHEN THE POWER FAILS FOR A FEW SECONDS? Isn't a properly running unit designed to withstand a BRIEF power outage? We have a surge protector from our utility company on our main line. Could this create a problem? The utility company engineer says not. Could this be a software issue with the Infinity controller? All settings appear to be correct on the control panel. Any info I could share with our tech would be appreciated. He is competent, but may not be as familiar with the Infinity system, as he has only worked on a few of them.