Why is my AC system freezing up?

There are a lot of reasons why your AC system freezes up in Canada. Nearly all of them typically need pro AC repair.

Checking the air filter isn’t dirty and airflow isn’t lowered are the only tasks you can safely handle on your own. If you need to put in a new the filter, you can accelerate the defrosting process by switching off the system and turning on the fan. If you have a heat pump, you can turn it to heat mode until the ice has melted.

After the ice disappears, move the temperature back to normal. If your system freezes a second time, call Service Experts Heating & Air Conditioning to take care of the problem.

Here are several other reasons why your equipment might be freezing up.

Not enough refrigerant—Freezing can be created by a refrigerant leak.

What causes a leak?

  • Weakened solder joints
  • Friction from piping rubbing against something
  • Broken valves
  • Slack fittings

How long your unit has been installed and the location of the leak play a role in whether you should repair or replace your AC system.

Dirty evaporator coil—Over time, the evaporator coil becomes dirty and creates problems similar to a clogged filter. You’ll gradually get lower airflow until your unit freezes or stops cooling. You’ll need to contact Service Experts Heating & Air Conditioning to fix the malfunction.

Broken blower motor or relay—A blower motor working at an inaccurate speed or not working at all can create freezing. It may also be intermittent, running at maximum speed and decelerating after it gets too hot. Or a relay may force it to work one time and not the next. In either situation, you will need to contact Service Experts Heating & Air Conditioning to correct the problem.

Scheduling yearly AC maintenance or heat pump maintenance could help you avoid this issue. Our professionals will fully inspect and clean your unit, which usually allows us to pinpoint small problems before they become huge problems.