Mitsubishi Air Conditioner Error Code SA

The SA code means the safety stop function has been activated, causing the unit to shut off all outputs. This is a deliberate protective shutoff triggered by either an emergency stop device being activated or an open circuit in the S1/PC or S2/PC control wiring. The unit will not operate again until the triggering condition is corrected.

The SA code itself indicates the system has shut down safely in response to a detected control circuit issue. The unit is not operating, so there is no immediate danger from the system running. However, you should not attempt to bypass the safety stop circuitry, as it exists to protect both the equipment and occupants.

Repair costs depend on what caused the safety stop to activate. If the fix involves resetting an emergency stop device or reseating a loose wire, costs may be limited to a service call fee, typically in the range of $75 to $150. If wiring replacement or a new emergency stop component is needed, total costs including parts and labor could range from $150 to $400 or more depending on system complexity and local labor rates.

Some causes of the SA code are straightforward to address, such as resetting a tripped emergency stop button or reseating a loose wiring connection at the S1/PC or S2/PC terminals. However, if the issue involves tracing and repairing damaged wiring or diagnosing a faulty emergency stop device, it is recommended to have a qualified HVAC technician handle the repair to ensure the system is safe to operate.

Simply resetting or power-cycling the unit will not permanently clear the SA code if the underlying cause is still present. If an emergency stop device remains activated or the S1/PC or S2/PC wiring circuit is still open, the safety stop will activate again after the reset. The root cause must be identified and corrected first before a reset will hold.