Midea code E2

Midea E2 error code: indoor coil temperature sensor fault

Midea E2 means the indoor coil temperature sensor is reading open or short circuit. Why the code is about the measurement path, and where an owner check ends.

Source verifiedBy HVAC Bench Editorial DeskLast reviewed
Direct answer

What this means

Midea assigns E2 to a fault on the indoor coil temperature sensor, the thermistor clipped to the evaporator pipework. The control sees the sensor reading as an open circuit or a short circuit, so it stops relying on it. The fault is in the sensor, its wiring, or the board input, not in the coil itself.

Equipment and model context

Midea wall-split systems, and systems built on the same platform sold under other names, that publish E2

  • Midea EVOX
  • Midea All Easy
  • Midea Xtreme Save
  • platform-partner wall units

This meaning follows Midea troubleshooting and service literature for wall-split systems that list E2 as the indoor coil or tube sensor fault. Midea supplies platforms to other brands with the same code table, and Midea's own portable and window units number codes differently, so confirm the model.

What you may notice

  • The indoor unit shows E2 and stops, or runs with reduced or erratic behaviour, shortly after start-up.
  • The code can be steady or intermittent, sometimes clearing on a restart and returning later.

Likely causes

  • The coil sensor thermistor has drifted out of range or gone open or short circuit, or its wire has chafed or broken where it runs to the board.
  • The sensor plug has worked loose or corroded at the indoor control board, or the board input that reads it has failed.

Diagnostic paths

E2 is intermittent and clears on a restart

The code comes and goes, a power cycle clears it for a while, and it tends to return after the unit has run for a time or when it is warm.

Have a technician reseat and inspect the sensor connector at the board and check the harness for a chafed spot, since a fault that moves with temperature or vibration points at a connection rather than the sensor element.

E2 is steady and present from every start

The code appears immediately on power-up every time and does not clear, and the unit will not run a normal cycle.

Arrange a technician to measure the sensor resistance at the board and again at the sensor, comparing both with the resistance and temperature table for the model, to place the fault in the sensor or the wiring.

The measurement path E2 is judging

The control reads the coil temperature as a resistance through the sensor and its wiring. E2 is that reading coming back as an impossible value, open or shorted.

  1. Coil sensorA thermistor clipped to the evaporator pipe
  2. Sensor leadThin wire running back to the indoor board
  3. Board connectorPlug where the sensor lands on the control board
  4. Board inputCircuit that turns the resistance into a temperature
  5. E2 raisedReading is open or short, so the value is rejected
Where an E2 sensor fault sits
What the check findsWhat it meansNext step
Open or short at the board, correct at the sensorA break or short in the harness between themRepair or replace the sensor lead
Open or short at the sensor itselfThe thermistor element has failedFit the correct replacement sensor
Correct resistance at both pointsThe board input is misreadingThe indoor control board is the suspect

E2 is about the reading, not the coil

The indoor coil sensor is a small thermistor, a component whose resistance changes with temperature, clipped to the evaporator pipework. The control passes a current through it and reads the voltage to work out the coil temperature, which it uses to manage frost protection and capacity. E2 is raised when that reading is not a plausible temperature at all: an open circuit, as if the wire were cut, or a short, as if the two conductors were touching.

So the coil itself is not the subject of the code. The fault is somewhere in the chain from the thermistor, along its thin lead, through the connector, to the input on the board. Any one of those failing gives the same E2. The coil can be perfectly healthy while the control has simply lost its ability to measure it.

What a technician does with E2

The diagnosis is a resistance measurement in two places. A technician unplugs the sensor at the board and reads its resistance there, then reads it again right at the sensor element, comparing both with the resistance and temperature table published for that model. If the reading is wrong at the board but right at the sensor, the lead between them is broken or shorted. If it is wrong at the sensor too, the thermistor has failed. If it is correct at both points, the board input is the suspect.

None of this is an owner task, because it means opening the indoor unit, working near the control board, and identifying the correct replacement part by model. An owner-safe restart can confirm whether E2 is intermittent, which is a useful clue, but the meter work that locates the fault belongs with a technician.

Service handoff

What to give the technician

Hand the technician the indoor and outdoor model numbers, whether E2 is steady or intermittent, whether it clears on a restart, and whether it tends to return when the unit is warm or has been running a while.

Homeowner safe

Safe homeowner checks

  1. Note whether E2 is steady from every start or intermittent, and whether a power cycle clears it and for how long.
  2. Record the indoor and outdoor model numbers so a technician can look up the correct sensor resistance table.

Is a reset appropriate?

A restart can show whether E2 is intermittent, which helps a technician. It does not repair a broken sensor or wire, so a returning E2 needs a meter rather than another reset.

Stop point

When to call a technician

  • Measuring the sensor resistance, inspecting the harness and connector, and replacing the sensor or the board all require opening the indoor unit and belong with a technician.

Questions people ask about this

Does Midea E2 mean the indoor coil is bad?

No. E2 is a fault on the coil temperature sensor and its wiring. The control has lost a valid reading from the sensor. The coil itself can be in good condition.

Why does my Midea E2 come and go?

An intermittent E2 points at a connection rather than a failed part. A plug making poor contact or a chafed wire reads correctly sometimes and open or short when vibration or heat moves it.

Can I replace the Midea coil sensor myself?

It means opening the indoor unit, working near the control board, and matching the correct part by model. The resistance checks that confirm the fault also need a meter, so this is technician work.

Evidence record

How this page was checked

official manufacturer support article, service manual · checked 2026-09-09

Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: Midea technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.

Documentation class
official manufacturer support article, service manual
Scope of the definition
Midea wall-split systems, and systems built on the same platform sold under other names, that publish E2
Last checked
2026-09-09