How to Fix / Troubleshooting

Safety: Turn OFF cooling and allow ice to melt before further diagnosis. Protect surrounding areas from water.

Thaw system: Set thermostat to OFF and fan to ON until all ice has melted.
Replace filter: Install a clean filter and ensure all supply and return vents are open.
Check blower speed taps: On the Coleman air handler, verify the blower motor is wired to the correct speed tap for cooling per the wiring diagram.
Inspect coil: Clean a dirty evaporator coil to restore airflow.
Refrigerant evaluation: If icing recurs, have a technician check for low refrigerant charge and leaks.

Warning: Do not run the system in cooling mode while iced; this can damage the compressor.

Coleman air conditioner frequently freezes up, with ice forming on the indoor coil or suction line.

Possible Causes