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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?
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Carrier says they carry them on their website. Really though, you need a qualified engineer with gauges and refrigerant gas. There isn't much you can do yourself.
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.
Which coil?, indoor or out? Indoor coils freeze due to clogged filters, low freon, blower motor not working. Outdoor coil freezing could mean, in rare cases in cooling mode, reversing valve not shifting.
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. The other possibilities will need to be check by a qualified service technician.
Yes it is normal especially with high humidity. The moisture freezes on the coils just like on the evaporator coils in a freezer. The heat pump will defrost itself by shutting off the fan outside and reverse the flow of refrigerant to melt the ice when it build up then switch back to normal heat. That's why at times you may feel cold air coming out of the vents in the house. The outside coils are defrosting.
if your system is a heat pump you can switch to heat and see if coil outside gets cold while indoor blows warm air - then switch back to a/c - both coils should not be cold at the same time - low freon pressure / dirty coil / dirty filter / low air flow causes freezing
no, its the condenser
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