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Carrier heat pump freezing up - Heating & Cooling

Posted by julie419 on

  • lawrencedoll May 11, 2010

    no, its the condenser



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Frank Fernandez

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Check refrigerant pressures, it's probably low on refrigerant. When you say "freezing up" I am assuming you are referring to the Evaporator/Air Handler?

Posted on Apr 30, 2008


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I have a Honeywell Chronotherm IV plus with a Carrier 25HBA heat pump. Installed last winter and worked great. This spring set to cool and will not cool.

Be sure it is wired for heat pump rather than conventional and also tstat has been told it is operating a heat pump in the settings menu.

If you need further help, reach me via phone at

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All Carrier has on this is installation instructions & field wiring. If your heat pump is freezing up, then check your defrost board to see if the timing jumper for checking the freezestat is set to 30,60, or 90 minutes. If it is set to 90, then set it either to 30 or 60 for the board to check the freezestat more often to go into defrost. Then again, the system could be a little low on refrigerant.

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I have Carrier Heat pump model # 25HBA. It was installed 3 years ago. I have had problems with it several times. This time, it is freezing up on the outside unit. My electric bills have sky rocketed. What...

The cooling coils are freezing because the gas (coolant) in the system may need replenishing or a small leak in the system. Something you can check yourself, is whether or not the foam insulation on the refrigerant tubing coming out of the unit is still intact. If not, that tubing is probably freezing too.
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