Why is AC freezing up after replacing fan motor? ?

Hello prior to having to replace the fan motor the AC never froze up. Since changing the condenser fan motor the AC is now freezing up. The fan is compatible except instead of 1100 rpm it spins at 1050 rpm. My old fan motor was a 3 wire the new one is a 4 wire but I just capped off the white and brown wire . The blade is spinning the correct way and the filters are new and the coils are clean. The condenser is also open with nothing blocking airflow and clean. When I set the temp high enough the unit turns on and shuts off like it should but when I go down to 71-72 it freezes up. Any ideas?

Anonymous2021-04-05T06:30:21Z

it's cold outside sometimes

0 0

a2021-04-04T14:04:25Z

Only are generally only 2 things can cause that condition.
Low air flow across the evaporator coil or low charge.
While most know to keep clean filters in their HVAC system, few ever clean the evaporator coil because it is either difficult to get to or impossible.
Evaporator fins get plugged with dirt over time which restricts the air flow and causes freezing

0 0

garry2021-04-02T07:45:19Z

may be because they are suppose to freeze up or you would have a heater instead of a cooler thats why ...

0 7

thebax20062021-04-01T23:54:50Z

I'll wager that the fan is blowing backwards. If it is in front to the condenser it needs to be blowing towards the motor. If the 134a is low in charge it can also ice things up.

3 1

jimanddottaylor2021-04-01T21:46:21Z

Various things can cause the AC to freeze up. One is the lack of air circulating by the fan. This does not seem to fit your scenario

2 0

Show more answers (6)

Why is AC freezing up after replacing fan motor? ?

Trending Questions