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Error code reference

Mitsubishi Air Conditioner Error Code E.AIE

Analog input fault

Mitsubishi codesMitsubishi air conditioner codes

Analog input fault - 30 mA or higher current or 7.5V or higher voltage input to terminal 2/4 while wrong input type selected.

First step from the service manual

Check the Pr.73, Pr.267, and voltage/current input switch settings.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E.AIE means on a Mitsubishi air conditioner

The E.AIE fault code on a Mitsubishi air conditioner indicates an analog input error caused by a mismatch between the selected input type and the actual signal being received at terminal 2 or terminal 4 of the control board. Specifically, the fault triggers when the controller detects a current of 30 mA or higher, or a voltage of 7.5V or higher, arriving at these terminals while the unit is configured to expect a different signal type. This is a protection fault designed to prevent damage to sensitive analog input circuitry from an out-of-range or incorrectly routed signal.

The root of this fault almost always lies in a configuration mismatch between parameters Pr.73 and Pr.267 and the physical hardware switch setting for voltage or current input selection. Pr.73 controls the characteristics of the frequency command from the analog input, while Pr.267 governs the input signal type assignment for terminal 4. If the parameter settings specify a voltage input but the wiring delivers a current signal (or vice versa), the unit will detect the incompatible signal level and throw the E.AIE code. The physical voltage/current toggle switch on the control board must also align with both the parameter settings and the connected signal source.

Diagnosing this fault requires verifying the consistency of three elements: the Pr.73 and Pr.267 parameter values as programmed, the position of the analog input type selection switch, and the actual signal type and amplitude present at terminal 2 or terminal 4. Use a multimeter to confirm what voltage or current level is arriving at the terminals before making any parameter changes.

Source: manufacturer service documentation.

Common causes of E.AIE

  1. 01

    Mismatched input type parameter settings

    Wiring / connection

    Parameters Pr.73 or Pr.267 are set for voltage input while the connected control device is sending a current signal, or the reverse. Check both parameter values and compare them against the actual signal source type.

  2. 02

    Incorrect voltage/current input switch position

    Wiring / connection

    The physical analog input selection switch on the control board is set to voltage mode while a current signal is wired in, or vice versa. Locate the switch and confirm it matches both the parameter settings and the field wiring.

  3. 03

    Wiring error at terminal 2 or terminal 4

    Wiring / connection

    A control signal wire has been connected to the wrong terminal, causing an incompatible or excessive signal level to appear at the analog input. Inspect all low-voltage control wiring against the wiring diagram.

  4. 04

    Faulty or overdriving external controller

    Wiring / connection

    An external BMS, thermostat, or controller is outputting a signal that exceeds the 30 mA or 7.5V threshold at the analog terminal. Measure the output of the connected device directly to confirm it is within acceptable limits.

  5. 05

    Damaged analog input circuit on the control board

    Part replacement

    If wiring, switch positions, and parameter settings all check out correctly but the fault persists, the analog input circuitry on the control board may be damaged. Board replacement would be required in this case.

See the test procedure for each cause

Frequently asked questions about E.AIE

What does E.AIE mean on a Mitsubishi air_conditioner?
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.
How do I fix the E.AIE error on my Mitsubishi air conditioner?
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.
Is the E.AIE error on a Mitsubishi air conditioner dangerous?
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.
Will resetting the unit clear the E.AIE error code?
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.
How much does it cost to repair an E.AIE error on a Mitsubishi air conditioner?
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.

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