Frozen Evaporator Coils Troubleshooting Easy List
Frozen Evaporator Coils Troubleshooting - It was a very hot day and I got a ticket to respond to a call for no cooling. The customer said there was ice on the air conditioner. The heating and cooling service operator instructed the customer to turn the AC off so the ice could thaw before I got there to figure out the problem. It needs to be thawed before any AC troubleshooting can occur. There are two main causes why the evaporator coil will freeze and cause ice on the air conditioner. One is decreased or no airflow and the other is a low refrigerant charge.
For the first problem, you can likely repair it yourself quite easily for some of the cases. For example, on our list below, you can easily change a dirty air filter but I would not expect most people would want to change a bad blower motor. However, for the refrigeration problem, you need to call in a licensed HVAC technician to make the repair. A frozen evaporator coil was frozen for a reason and the ice only diminishes airflow even further making the air conditioner or heat pump totally useless for its intended purpose.
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