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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8062
Experience:  Furnace, A/C and heat pump specialist.
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Outside unit is freezing up? What could it be?

Customer Question

outside unit is freezing up? What could it be?
Submitted: 2 years ago.
Category: HVAC
Expert:  airheatman replied 2 years ago.
Hello. My name is ***** ***** I'll do my best to help. Let's get started and see what we can do.Do you still need help with this?
Customer: replied 2 years ago.
Expert:  airheatman replied 2 years ago.
Unit will ice because of two things.
1. Low air flow
2.Low refrigerant
SEveral things can cause these issues.
1.Indoor blower not running when compressor outside is
2.Dirty filter or indoor coil
3.Blocked return grille or restriction in duct
4.Contactors tuck in outdoor unit allowing unit to run non stop after blower inside cycles off.
5. Low refrigerant caused by a leak
Lets start with the simple. Make sure outdoor cycles off with thermostat and that filter is clean. WE will go from there.
Customer: replied 2 years ago.
filter has been change unit has cycled several times work for a day or so then it just froze up again
Expert:  airheatman replied 2 years ago.
Contactors may be sticking sometimes in outdoor unit.Did you notice if outdoor is cycling off with blower every time?
Customer: replied 2 years ago.
didn't notice that when the inside unit is running outside fan is not coming over until a couple minutes later
Expert:  airheatman replied 2 years ago.
That is ok, most likley a time delay. Do you have access to a set of refrigerant gauges?
Customer: replied 2 years ago.
yes I do
Expert:  airheatman replied 2 years ago.
Great lets connect the gauges and tell me what each is reading.Blue to large valve and red to small valve.