Thermostat Issues
If your heat pump is having trouble changing modes, it’s possible that the issue lies with the thermostat. The thermostat is responsible for sending the signal to the solenoid that controls the reversing valve. If there is a problem with the thermostat, this signal may not be sent, which can prevent the heat pump from changing modes.
Checking the thermostat is a relatively easy task that you can do yourself. First, make sure that the thermostat is set to the correct mode (heating or cooling). If it is, then check to see if the batteries need to be replaced. If neither of these solutions works, then you may need to call a professional to take a look at your thermostat.
Clogged Air Filter
A clogged air filter can also prevent your heat pump from changing modes. If the air filter is too dirty, it can restrict airflow to the point where the heat pump isn’t able to function properly. This can cause a number of different problems, one of which is an inability to change modes.
If you suspect that your heat pump’s air filter is the culprit, the best course of action is to replace it. This is a relatively easy task that you can do yourself, and it only takes a few minutes.
Ultimately, if you’re in doubt about your heat pump’s ability to change modes in preparation for this warmer season, the best course of action is to call a professional. They will be able to diagnose the problem and recommend the best course of action.