If a Mini Split fails to respond when you try to turn it on or off and you already checked the batteries on your remote and the same happens when trying to turn it on manually; there’s probably an electrical issue or the reversing valve may need replacement.
UNUSUALLY HIGH ELECTRICAL BILLS
The average lifespan of a Mini Split is 12 to 15 years. HVAC systems lose efficiency with age. In a younger unit, high energy consumption could signal anything from grungy equipment or a clogged air filter to short-cycling or failing parts.
REDUCTION IN COOLING OUTPUT
A lack of cool air can indicate a refrigerant leak. Once it has all drained out of the system it will simply operate as a fan and nothing more. Refrigerant tends to leak slowly over time and you get a gradual decrease of cooling capacity.
GRINDING NOISE COMING FROM AN INDOOR UNIT
This usually means that the oiled bearings used to reduce motor friction have worn down. This could result in the air handler motor overheating and burning out.
ICE FORMATION ON YOUR OUTDOOR UNIT’S COOLING COILS
Reduced air flow can cause the evaporator coils to freeze over. This could be due to a clogged air filter, a malfunctioning thermostat, a broken fan, a refrigerant leak or dirty coil. If ignored, the weight of the ice can warp the cooling coil and require a complete coil replacement.