Why does ice form on my exchange line on my central AC when I run it on full auto?
Question:When I set the t-stat to full auto,(in other words, fan turns on only when when the compressor starts) ice forms on the insulated exchange line between the compressor and the coil, and the compressor will not shut off - I have to kill the power from the circuit breaker box; when I leave the fan on continuously, no ice forms and the unit cools properly, however if I don't leave the fan on, ice forms on the line and the unit can't cool. The constant noise from the fan can be a little annoying.
Answers:
It sounds like the contactor on the condenser unit may be bad. Sometimes when they go bad they stick and the unit will not turn off others the unit will not turn on.
The reason the coil and the suction line freezes up is because after the thermostat turns the blower on the indoor unit off the evaporator coil gets very cold.
This is not a good situation because you will eventually damage the compressor.
Alternatively you could hire 10 big guys/or girls to fan it very vigorously using those quiet Japanese paper fans, if you have them naked and get them dancing you could charge admission to offset the cost of the electricity.
might be low on freon I would have it checked out tho
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