Fraser-Johnston
Evaporator Coil Icing
The indoor unit freezes up with ice on the evaporator coil.
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Possible Causes
Restricted airflow from a dirty filter, Blower motor running at low speed or failing, Low refrigerant charge, Thermostat set too low for ambient conditions
How to Fix / Troubleshooting
Safety: Turn off the system and allow ice to melt completely before further operation.
- Replace filter: Install a clean filter and ensure all registers are open.
- Check blower: Verify strong airflow from supply vents. If weak, inspect the blower motor and wheel.
- Adjust thermostat: Avoid setting the thermostat extremely low (e.g., below 68°F) in humid conditions.
- Call technician if recurring: Repeated icing after airflow corrections suggests low refrigerant or metering device issues.
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Repair Difficulty
Easy
2/5
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