Error Code

Mini splits communicate problems through error codes — a sequence of numbers or letters that shows up on the remote display or flashes on the indoor unit. Each brand has its own code system, but they generally point to specific problems: low refrigerant pressure, a faulty sensor, a communication issue between units, or a blower motor problem. Googling the code can give you a ballpark idea of what's wrong, but actually diagnosing and fixing it requires someone who knows the system. If your unit is flashing an error code and won't run, write it down before resetting the system — that code is useful information for the technician.