Mitsubishi Air Conditioner Error Code E.AIE

E.AIE is an analog input fault code indicating that a signal of 30 mA or higher current, or 7.5V or higher voltage, has been detected at terminal 2 or terminal 4 while the unit is configured for a different input type. The fault is triggered by a mismatch between the actual incoming signal and the input type selected through parameters Pr.73, Pr.267, and the hardware voltage/current switch. The unit raises this fault to protect its analog input circuitry from damage.

The E.AIE fault itself is a protective response rather than a sign of immediate danger. The unit shuts down to prevent damage to its analog input circuitry from an out-of-range or incorrectly configured signal. However, the underlying wiring or configuration issue should be corrected promptly to avoid potential damage to control board components over repeated fault events.

If the fault is due to incorrect parameter settings or a switch position error, the repair may involve only a service call fee, typically in the range of $75 to $200 depending on your location and the technician. If a wiring correction is needed, labor costs may add to that total. In the unlikely event that the control board has been damaged and requires replacement, parts and labor combined can range from $400 to $900 or more depending on the model.

Start by checking parameters Pr.73 and Pr.267 to confirm they match the type of control signal connected to terminal 2 or terminal 4. Then verify that the physical analog input selection switch on the control board is set to the correct position for voltage or current input. Finally, use a multimeter to confirm the actual signal arriving at the terminals does not exceed the rated limits. Correcting any of these mismatches should clear the fault.

A reset may temporarily clear the E.AIE code, but the fault will return if the underlying configuration mismatch or wiring issue has not been resolved. The parameters Pr.73 and Pr.267, the analog input switch position, and the signal type at the terminals must all be consistent with each other before the unit will operate normally without the fault recurring.