Comfort Heating & Cooling

Heating Mode

Under certain weather conditions, the outside unit will develop ice buildup.

When the unit defrosts this ice, it gives off water vapors which appears to be smoke.
If excess ice builds up on the outside coil after more than 90 minutes elapse time, switch emergency heat to “ON” (located on the thermostat).
Call your serviceman if the condition does not clear.

Auxiliary heat light “ON” (located on thermostat).

Supplementary heaters are providing heat (usually when outside temperature is lover than 30 degrees).
Thermostat has been adjusted up more than 1.5 degrees, which causes supplementary heaters to come on until thermostat is satisfied.
If auxiliary heat light stays on when the outside temperature is about 30 degrees, call serviceman.

Little or no air flow at supply registers.

Filters are dirty—replace.
Blower motor or belt failure.
Possible air leak from ducts.
Return grill blocked

Outside unit continuously running in moderate weather. (All units run continuously below the balance point, usually when outside temperature is lower than 30 degrees).

Thermostat set too high.
Thermostat needs adjustment.
Low refrigerant level in unit.
Outside unit coil blocked by snow, ice, etc.

Cooling Mode

Outside unit continuously running.

Low refrigerant level in unit.
Thermostat set very low or very warm weather.
Outside coil partially blocked.
Thermostat located near heat source, such as appliances, TV, etc.
Dirty Filters or too many registers closed limiting air movement.

Unable to cool house and reduce humidity level.

Condensation drain blocked.
Low refrigerant level in unit.
Possible compressor failure.
A door or window open.
Check for air leaks and excessive moisture in crawl space.

Troubleshooting A Heatpump

Heating Mode

Cooling Mode