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When the summer months are sweltering hot, the last thing you want is to melt in your own house after a fun day in the sun. Sometimes, fixing your heat pump is as easy as changing the filter, but other problems might require professional service.

1. Check the Power
If your heat pump isn’t turning on at all, check your circuit breakers and ensure they are all in the “ON” position.

2. Adjust the Thermostat
A good rule of thumb is to always set your thermostat to cool mode in the warmer months and adjust the temperature down to your liking. If it doesn’t work properly once you’ve decreased the temperature, try replacing the batteries.

3. Check the Air Filter
Over time, your heat pump’s air filter will naturally collect dust, dander, and other debris, which can clog it and inhibit cool airflow. Fortunately, this is an easy fix. Remove the air filter and if it looks dirty, rinse it with warm water to clean it or replace it with a new one.

4. Call Building Energy! Some problems aren’t as easy to fix!

  • When water leaks or drips from the indoor unit.
  • When the operation indicator lamp blinks.
  • When the breaker trips frequently.
  • The remote-control signal is not received in a room.
  • When an abnormal sound is heard.
  • When any refrigerant leakage is found

Leaks, freezes, and regular wear and tear can all reduce a heat pump’s refrigerant levels. When the refrigerant is too low, it can prevent cool airflow and create more problems further down the road.
Working with refrigerant can be dangerous, so don’t attempt to solve this issue on your own.
Checking refrigerant levels requires specialized tools and expertise.

If you still have your owner’s manual that came with your heat pump, it should cover these and other problems some may have with their system. If you cannot find your owner’s manual, this handy guide is packed with helpful technical information and is applicable to most Mitsubishi ductless heat pump systems. Be sure to add this link to your favorites on your web browser or print a hard copy.

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