If you are having problems with your condenser not getting 24 volts it could be a problem with the wires from the box. They can have a small gap between the wire and the body of the unit, which is why they aren’t getting as much voltage as they should. Usually this will just cause the box to stay open and not get the amount of power that it should. You need to make sure that you buy new wires and you reassemble the unit to get the problem fixed.
Another reason that your condenser isn’t getting the power that it needs could be the fan itself. The fan isn’t always putting out enough air and not enough heat to keep the heater working. This is the best time to take the fan apart and clean it. If you’re going to take it apart, you may want to have it professionally done so that you know you will get a quality product. This is also a good time to clean the inside of the unit to ensure that the pipes aren’t clogged up and you don’t have any leaks.
Something else that can cause your condenser not to get 24 volts could be a melted thermal fuse. The only way to fix this is to replace the fuse. If you can’t get it replaced then you’ll have to remove the panel and pull the fuse off. If it is damaged, you will need to have it replaced. This is easy to do, just contact your heating and air conditioning contractor and he or she can give you the proper directions. They should also be able to tell you how much it will cost you.