Leave a Reply

Your email address will not be published. Required fields are marked *

2 Comments

  1. Gary gibson says:

    My 3 ton Ameristar outside unit cuts on and off in heat mode. Tech came out said had leak in inside coils, replaced air handler. Filled Freon and replaced dryer and defrost board still having unit cutting on and off air handler running. Works great on ac but not on heat any ideas?

    1. There are a few possible reasons why your 3 ton Ameristar outside unit is cutting on and off in heat mode, even after a technician has replaced the air handler, filled the refrigerant, and replaced the dryer and defrost board.

      Incorrect refrigerant charge. It is possible that the technician did not correctly charge the refrigerant level in the system. If the refrigerant charge is too low, the system will not be able to properly heat your home and will short cycle.
      Faulty compressor. The compressor is the heart of the heat pump system, and if it is faulty, it can cause the system to short cycle.
      Faulty reversing valve. The reversing valve is responsible for changing the flow of refrigerant in the system from heating to cooling mode. If the reversing valve is faulty, it can cause the system to short cycle in heat mode.
      Frozen evaporator coil. If the evaporator coil is frozen, it will restrict the airflow through the system and cause the compressor to overheat. The compressor will then shut down to protect itself, and the system will short cycle.
      Dirty air filter. A dirty air filter can restrict airflow through the system and cause the compressor to overheat. The compressor will then shut down to protect itself, and the system will short cycle.

      I hope these informations may help you to identify the problem with your unit.