AirEase mini split error code E5

Common causes

• The indoor evaporator coil temperature (T2) thermistor has failed (they do drift and fail with age and heat cycling).
• Its plug has worked loose from the control board, or a pin has corroded.
• The sensor lead is chafed, pinched or chewed, giving an intermittent open or short.
• The control board's sensor input has failed (rare compared with the sensor itself).

How to fix it yourself

Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician.

1. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.
2. If the code comes straight back after a reset, the fault is real and not a glitch.
3. With power off, locate the indoor evaporator coil temperature sensor (T2) pushed into a small copper well on the evaporator coil, reachable with the front panel and filters removed. Follow its lead back to the board and reseat the plug firmly.
4. Inspect the lead for damage along its whole length, especially where it passes through the chassis.
5. If you have a multimeter, unplug the sensor and measure its resistance. A reading near zero ohms (short) or infinite (open) confirms a bad sensor. Most mini split thermistors read roughly 5 to 20 kΩ at room temperature, so a value in that range with a steady drift as you warm it in your hand means the sensor is fine and the board is the suspect.
6. Replacement thermistors are inexpensive and plug in. Match the part number from the parts list for your model.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

Sensor swaps are a doable DIY job on most units. Call a technician if the sensor tests good and the code persists, because that points at the control board.

Which AirEase units show E5

This page applies to AirEase 4DHV outdoor with DWH wall-mount indoor (2016 and later) units. AirEase's own documentation lists E5 as "Evaporator coil temperature sensor (T2) open or short circuit", the same definition used across the Midea platform (classic codes) it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.

Where AirEase shows this code

The code appears on the indoor unit's LED display in place of the set temperature. Some models also blink the indicator lamps in a pattern that matches the code. E codes are faults in the indoor unit or its communication link, F codes are faults on the outdoor side, and P codes are protections: the outdoor unit has stopped itself to prevent damage. EC is the refrigerant leak check.

Other AirEase codes

Same part of the system as E5:

All AirEase error codes

E5 on other brands

The same characters do not always mean the same thing. Check the brand on your unit.

• Pioneer E5 Evaporator coil temperature sensor (T2) open or short circuit / Over-voltage or under-voltage protection (outdoor display)
• Blueridge E5 Over-current protection / Evaporator coil temperature sensor (T2) open or short circuit
• Gree E5 Over-current protection
• Zone Air E5 Model configuration or mismatch error
• Daikin E5 Compressor motor lock or overload
• Mitsubishi Electric E5 Indoor unit signal transmitting error (to remote controller)
• Carrier E5 Evaporator coil temperature sensor (T2) open or short circuit
• Trane E5 Model configuration or mismatch error / Indoor unit signal transmitting error (to remote controller)
• Heil E5 Evaporator coil temperature sensor (T2) open or short circuit / Over-current protection
• ACiQ E5 Evaporator coil temperature sensor (T2) open or short circuit / Model configuration or mismatch error