Do-It-Yourself Heat Pump Trouble Shooting

by | Apr 9, 2019 | HVAC Blog

If You Think Your Heat Pump Is Not Heating:

  1. Check the THERMOSTAT first. Make sure it turned ON and set to HEAT- and make sure the set temperature is not lower than the actual room temperature! The furnace won’t turn on if the thermostat is set at 60 and the room temperature is 68 degrees, which may be easily overlooked on an unfamiliar thermostat.
  2. Set the temperature 2 to 4 degrees above the set thermostat temperature. (FYI- If troubleshooting a heat pump in summer in cooling mode, the process is similar- just set the temperature below the set temperature.)
  3. Turn on the FAN. If the fan doesn’t start, check your circuit breakers and fuses and replace them if needed. If the fuse is blown or the breaker flipped, you may need to call Oasis for help to determine the cause of the overload (i.e.: a bad connection, a seized blower motor or a controller board short.)
  4. If your fan works, but you still get only cold air, check to see if you can get warm air when the thermostat is set to EMERGENCY HEAT, which is at least five degrees above room temp. If you feel warm air, then you need a service technician to check the outdoor unit. If you don’t feel warm air, you may have a defective thermostat or air handler.

What Else Can You Do?

There are a few things to look for while troubleshooting your heat pump:

  • You See The Exterior Unit Is Iced Up. This may mean the defrost timer isn’t putting the unit into defrost mode; or refrigerant charge is low; or refrigerant flow is restricted by a bad metering device.
  • You See The Refrigerant coils are Dirty. Coils covered with dirt significantly diminish efficiency.
  • You Notice Your Unit Is Running In Air Conditioning Mode. This may be due to a malfunction of the reversing valve which usually automatically switches from cooling to heating.
  • You can’t hear the compressor running. The compressor needs professional troubleshooting.
  • If you didn’t blow a fuse or trip the circuit breaker, Look for Loose, Frayed or Worn-Out Wiring on your heat pump. The problem could also be a defective thermostat or a jammed fan relay.
  • Clear Away Encroaching Plants, Trash, Leaves, Snow Drifts or Any Other Obstructions which lay against the outdoor unit.
  • A Disconnected Air Handler in The Attic or basement will pull in cold, unconditioned air.

Want To Be Able To Just Set It And Forget It?

With an Oasis Maintenance Service Plan cold weather tune-up, you can cuddle up in comfort, assured your heat pump has been cleaned, the refrigerant has been checked for leaks or restrictions and has been recharged, the wiring is safe and aging parts have been repaired.

We hope this information helps you. Please remember, if you’re too hot or too cold or you don’t feel comfortable troubleshooting or maintaining your HVAC equipment yourself, be sure to get it done by your trusted local trained professionals at Oasis.

Call Oasis for Information On A Time & Money Saving Service Agreement!

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Call Oasis Air Conditioning & Heating, Inc.

(520) 648-1755

It’s Your Home – Make It Your Oasis!


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