Locate the thermostat controlling the air conditioner. The thermostat senses the surrounding air temperature and activates the air conditioner when the RV becomes too hot. Make sure the thermostat is not mounted in a location that has a cold air register blowing directly upon it. This cold air will cause the thermostat to cool too quickly during air conditioner operation, causing frequent on and off intervals. Relocate the thermostat, if necessary.
Remove the air conditioner's outside cover with a screwdriver, and inspect the evaporator's coils, as well as the condenser's fins. Dirty or clogged coils and fins causes poor air circulation within the air conditioner. As a result, the coils and fins become covered in ice, causing short cycling. Clean the coils and fins of any debris, dust or ice.
Locate the air-conditioner's filter. Similar to the coils and fins, a dirty filter hinders air circulation as well, causing short cycling. Clean or replace the filter as needed. Some air conditioning filters are reusable, allowing an owner to rinse them clean. Alternatively, other filters are designed simply for one-time use.
Inspect the surrounding floor area near the air conditioner's components. Look for any refrigerant leaks, which cause low pressure within the unit. As a result, the air conditioner will short cycle in response to the reduced refrigerant level. Call a technician if a leak is detected. The leak will require repair and replenishment of refrigerant.
