If you want to roll up your sleeves and try to fix heat pumps, a good place to start is with the thermostat. It is the most common area of problems. If it is not set at the right setting, then it will not come on. In some cases, the system may be faulty and that can lead to concerns related to the function. In other cases, you may have just replaced it and it stops working properly. If that is the case, you may have wired it wrong or you may have purchased the wrong model. You will need one for this specific type of heating system.
Is It Getting Power?
Sometimes, the unit just is not getting power. To find out, check the circuit breaker to ensure it is operational. You also need to check the main electrical panel and any subpanels (do not assume that the main system is going to have this pump on it). If it does not seem to be getting power but there are no breakers flipped, you may have a short in the system.
More Significant Problems
In some cases, you may find that the system needs resetting. If that does not work, you may want to ensure all of the electrical elements in the actual pump are working properly. If not, that is likely going to require replacement. It is also a good idea to consider the function of the motor. If it is not operational and you have checked all of these other concerns, it may be time to call in a professional for repairs. These types of repairs can be expensive, but used parts and an affordable technician can reduce those costs significantly.