FAQ

WHAT DOES IT MEAN WHEN MY HEAT PUMP OR AIR CONDITIONER IS ICED-UP IN SUMMER?

It is never normal to see ice in the summer anywhere on a heat pump or a central air conditioner. This includes the indoor unit, outdoor unit and interconnecting line-set. It is possible to ice-up the indoor coil, however, if the air conditioner is running in very cold weather or if the thermostat is turned down extremely low. We recommend never turning the thermostat below 70 degrees. If air conditioning is needed during winter months, such as for restaurants or businesses, then a "low ambient kit" is required, and can be installed by a service technician. If you see ice anywhere on a heat pump or air conditioner during the summer, then there is most likely a problem and you should turn it off immediately. Below is a list of possible causes.

These items usually require a service call:

  • Bad indoor fan motor – not running/running slow
  • Loose, worn or broken fan belt
  • Bad indoor fan relay
  • Extremely dirty blower wheel
  • Low refrigerant charge
  • Restriction
  • Blocked capillary tube
  • Blocked orifice
  • Faulty expansion valve
  • Stuck compressor contactor
  • Faulty thermostat
  • Extremely dirty or damaged indoor coil

These items, however, can be addressed or even fixed by the homeowner:

  • Clogged or blocked air filter
  • Supply and/or return vents blocked or closed
  • Running air conditioner with windows open
  • Setting thermostat too low

One other thing to keep in mind: if you have a central humidifier, make sure it is shut off and if it has a damper – close it for the summer.

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