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
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