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Unit shuts down upon temporary loss of power

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. We left the power to the unit off for about an hour, and when we flipped the circuit back on, the error message was gone AND the unit came back on! 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. 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 just leaving it and waiting for it to reset on its own, 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 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 help is greatly appreciated!

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  • amandastonen Jul 19, 2009

    Thanks. That was the first thing they did...controller was replaced with a new one a couple months ago. It did not do the trick.


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Its time to shake a local rep and ask for an exchange on that controller. If they want to sale us on customer service then make them eliminate that as a possibility an exchange it for free.

Posted on Jul 18, 2009

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