We have a goodman split unit, It was below freezing the other morning and the unit had a squeaking sound when it started up. Now it has warmed back up, the unit is sounding as if it's trying to kick off and on. When it does this, all our lights in the house and even outdoor light will blink. I looked inside the unit and it makes a clicking like noise when it kicks on and this is when the lights blink. Blinks about 10-15 per hour. Thanks for any help.

It is meant to shut off when it gets so cold that the unit cannot make warm air from outside air that is too cold. When it reaches that situation, it should be switching the heating effort to the built in resistance heating. In other words, it gives up and directs that many KW of electricity go straight into heater coils, like and electrical dryer has. It is very expensive to heat this way. Most whole house heat pumps can't handle cold air. The newer mini split ductless heat pumps lower can work with outside air temperature below freezing depending on the manufacturer.

You need a new run capacitor on the outdoor unit.

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May be the fan in the external unit is ruined or the internal pump is comming loose. But note that the pump also make much effort until the gas flows smoothly through the pipes .

Low on freon, dirty evap, dirty filter or maybe restricted at the metering device

INDICATION OF DIRTY FILTERS OR COIL, OR UNDERCHARGED UNIT.

is the thermostat set for heat and you have power going to the unit correct

have a service man come out to do a tune and clean
1. check your filter.
2. Go outside (if you Have a Split unit to see if ths condensor is
working.
3. if its not thereyour Problem

the squeaking is simply the belt of your car moving. the freezing temps cause that problem thats why it quits when it warms up

Is your unit a Split system where one unit is inside (attic, garage, utility room) and another outside?? Is the outside unit unit running?? Is your thermostat electronic or the regular slide mechanical type??

First turn the main power off to the unit at the breaker, wait about five min. and switch the breaker back on, then see if this solves the problem. In the instalation manual that came with the unit on the last page you will see a code of the red blinking light, this will tell you the most likely problem if not solved by switching the breaker on again.............Hope this helps