Comfortmaker Evaporator Coil Icing

Ice forming on Comfortmaker indoor evaporator coil or suction line; reduced airflow and cooling

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Dirty air filter, Blower motor not running at full speed, Low refrigerant charge, Closed supply or return registers, Faulty TXV stuck closed

Safety: Turn off the system at the thermostat to allow ice to melt before further work.

Steps:

Replace filter: Install a clean filter.
Open registers: Ensure all supply and return vents are open and unobstructed.
Check blower: Confirm indoor fan runs strongly when set to FAN ON.
Inspect coil: After thawing, clean the evaporator coil if dirty.
Restart and monitor: If icing recurs quickly, low refrigerant or TXV issues are likely.

Technician required: Refrigerant and TXV diagnostics must be performed by a licensed HVAC technician.

Medium 3/5

Evaporator Coil and TXV

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