View Full Version : Pipe freezing over
theoali
Jul 19, 2013, 01:50 PM
I've narrowed it down to when my system freezes over but don't know why it is doing it. On my thermostat, if I turn the system "off" and put the fan to "auto" rather than "on", within an hour, the pipe coming into the house to my unit freezes up. Also, when it's in this state, my unit outside never stops working. If I have the system "off" and the fan "on", it does not freeze over
Hopefully I can get some answers
Cory
Joshdta
Jul 19, 2013, 03:36 PM
If fan is running then either air filter is cloged up or unit is low on freon. With system off ac is not running so it can't freeze
theoali
Jul 19, 2013, 06:40 PM
if fan is running then either air filter is cloged up or unit is low on freon. With system off ac is not running so it can't freeze
A friend of mine said it could be a defective thermostat considering the outside unit runs at all times
Joshdta
Jul 19, 2013, 06:47 PM
Doe the outdoor unit shut off with the t-stat set to off??
theoali
Jul 20, 2013, 06:54 AM
doe the outdoor unit shut off with the t-stat set to off???
No, the "T" stat is set to off and the unit outside is still going, the only time I've seen it stop is if I flip the breaker
Grady White
Jul 20, 2013, 04:55 PM
Will the outdoor unit shut off if you turn off the power to the furnace at the breaker? If not, it sounds to me like a contactor welded shut.
Joshdta
Jul 20, 2013, 06:48 PM
I agree sounds like you need a new contactor on the outdoor unit
theoali
Jul 21, 2013, 06:32 AM
i agree sounds like you need a new contactor on the outdoor unit
The unit outside shuts off if I turn off the breaker
Joshdta
Jul 21, 2013, 07:21 AM
https://www.google.com/search?q=ac+contactor&source=lnms&tbm=isch&sa=X&ei=F-7rUZ-oMrPA4AOUtoHQDg&ved=0CAkQ_AUoAQ&biw=1366&bih=643#facrc=_&imgdii=_&imgrc=9WWmRwknKxRwEM%3A%3B7y7TARNetCmaWM%3Bhttp%25 3A%252F%252Fwww.chinacontactor.net%252FContactor%2 52FMBC-2X-AC-Contactor.jpg%3Bhttp%253A%252F%252Fwww.chinacontac tor.net%252FMBC-2X-AC-Contactor.html%3B360%3B360
Make sure you turn breaker off to indoor and outdoor unit before replacing
Grady White
Jul 22, 2013, 06:22 PM
the unit outside shuts off if i turn off the breaker
Does the outdoor unit shut off only when you turn off it's breaker OR will it shut off if you turn off the FURNACE breaker? If it shuts off when the furnace breaker is turned off, the contactor is NOT the problem.
theoali
Jul 23, 2013, 07:18 AM
The heat pump unit outside ONLY shutsdown when I turn off it's own breaker. It does not shut down when I turn off the Furnace breaker
Joshdta
Jul 23, 2013, 04:19 PM
Contactor is bad
Grady White
Jul 23, 2013, 06:37 PM
contactor is bad
I concur.