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Air Mechanical, Inc. Blog

Heat Pump Question: Why Won’t My Heat Pump Start?

A heat pump that just doesn’t start one day is quite a common problem. The following are the most common problems that lead to an unresponsive heat pump.

  • A faulty thermostat
  • A faulty contactor
  • Some problem with the time-delay relay mechanism
  • A fault with the thermostat cable
  • The unit may be off due to a safety device being left open and exposed to high/low temperature, high/low pressure
  • A problem with the control module

There are instances in which the thermostat is not set correctly. This could lead to your heat pump not starting. If your emergency switch has been turned off, it could also lead to your pump being unresponsive. Apart from this, if your pump plug has been pulled out or the circuit breaker has tripper due to a surge, it could also lead to the same problem.

These may seem too obvious or simple but they are often the cause of an unresponsive heat pump. Other similar, simple problems may include a condensate pump switch being left open, the outdoor reset button may have been left off or the unit may have been locked out. In the last case, you can always turn the system off and turn it back on to get it to start working.

So before you go ahead and make that call to the service technician, make sure you check the following:

  • Ensure that no emergency switch is off
  • Make sure all breakers for the outdoor and indoor units are on
  • Check your fuses if possible
  • Check the safety switch on the condensate pump if you have one

If the problem persists even after trying all these steps, it is time to call the Andover heat pump technician. For any heat pump repairs that you need, give Air Mechanical Heating, Cooling & Plumbing a call!

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