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E2

Haier E2 on an air conditioner: pipe temperature sensor failure

Verified with sources1 sourceReviewed Oct 4, 2026
Technician coming? See the 2 steps they must show you
Wall-mounted split air conditioner indoor unit
Dinkun ChenCC BY-SA 4.0Image source

Risk level

Medium

Proceed carefully and stop if the check is unclear.

Urgency

Medium

Quick answer

On Haier air conditioners, E2 means a pipe temperature sensor failure. Haier asks you to switch the unit off and call its service: the customer cannot fix this code.

Safety first

Stop and check this first

  • Haier says these codes can only be solved by its after-sales engineers and cannot be fixed by the customer: switch the unit off and call Haier service. Do not open the casing; there is mains voltage inside.

Safe checks you can perform

  • Code on the display
  • Switch off and call service
  • Pipe sensor measurement

Leave these tasks to a qualified professional

  • Do not attempt this professional task: Regulation test
  • Do not attempt this professional task: Measure before replacing

What a technician must be able to justify

Technician visit

These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.

These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.

  1. Regulation test

    What they doAfter the repair, checks that the unit cools or heats normally without showing E2 again.

    They must show youthe unit regulating without a code.

    In writingdate, mode tested and test result.

  2. Measure before replacing

    What they doThe technician measures the pipe temperature sensor and checks its connector before replacing the sensor or the board.

    They must show youthe measured sensor resistance against Haier's specification.

    In writingthe code, the measured value, which part was replaced and why, with the date.

Before accepting a part or repair

Nothing has been shown yet. Do not accept a part swap based on the code alone.

Follow these steps

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

  1. Code on the display

    No special tools

    Who:
    you.
    How:
    look at the code on the indoor unit display and compare it with Haier's table.
    Result that matters:
    that the code is E2, not E1 (indoor temperature sensor) or F21 (outdoor coil temperature sensor).
    If it is E2:
    the suspect is the pipe temperature sensor.
    If it is E1 or F21:
    it is another sensor; this page does not apply.
    Evidence to keep:
    a photo of the display with the code, the date and the time.

    Evidence: Haier: How to do if display shows error code? Such as "E7" or "F8"

  2. Switch off and call service

    No special tools

    Who:
    you.
    How:
    switch the unit off, as Haier asks, and note the code and the model before calling Haier service.
    Result that matters:
    that the technician arrives with the exact code and model.
    If the code is still there after switching back on:
    do not insist; Haier says only its service can solve it.
    If it disappears:
    keep the photo anyway in case it returns.
    Evidence to keep:
    a photo of the model label and a note of the date.

    Evidence: Haier: How to do if display shows error code? Such as "E7" or "F8"

  3. Pipe sensor measurement

    Tools required

    Who:
    Haier service technician or certified refrigeration technician.
    How:
    with power off at the breaker, checks the pipe temperature sensor connector and measures it against the manufacturer's specification.
    Result that matters:
    whether the sensor is out of specification or measures correctly.
    If it is out of specification:
    the sensor is confirmed as the cause.
    If it measures correctly:
    the cause is in the connection or the board.
    Evidence to keep:
    a report with the measured value against the specification.

    Requires opening the indoor unit with power off: technician only.

    Evidence: Haier: How to do if display shows error code? Such as "E7" or "F8"

Still not solved

If the error persists, stop here. See what the technician must do and show you.

Where this code applies

A code is meaningful only inside the right product and version context.

Primary scope

System
HVAC
Brand
Haier
Product type
Air conditioner

Known code variants

  • Bosch E2 caldera
  • Candy 2 flashes
  • Candy 2 parpadeos
  • Candy dishwasher 2 flashes
  • Candy dishwasher E2
  • Candy dishwasher error E2
  • Candy dishwasher not filling with water
  • Candy lavadora E2
  • Candy lavavajillas E2
  • Candy washer E2
  • Candy washer not filling
  • Candy washing machine error E2
  • Cerapur E2
  • CHECK WATER
  • COMPROBAR AGUA
  • De'Longhi dehumidifier E2 E3 sensor
  • De'Longhi E2
  • De'Longhi E3
  • DeLonghi DD230P E2
  • deshumidificador De'Longhi E2 E3 sensor
  • deshumidificador Meaco E2 sensor de humedad
  • E02
  • E-2
  • E2 Worcester
  • E3
  • error E2 frigorífico Indesit
  • Error E2 Junkers
  • error E2 lavadora Candy
  • error E2 lavadora Samsung
  • error E2 lavavajillas Candy
  • error E2 lavavajillas Haier
  • frigorífico combi Indesit E2 sensor
  • Greenstar E2
  • Haier dishwasher E2
  • Haier dishwasher error E2
  • Haier dishwasher not filling
  • Haier E2
  • Haier lavavajillas E2
  • Indesit E2 error fridge freezer
  • Indesit E2 frigorífico
  • Indesit fridge freezer E2
  • Indesit fridge freezer E2 sensor fault
  • Junkers E2
  • lavadora Candy no coge agua
  • lavadora Samsung E2 agua en el tambor
  • lavadora Samsung no desagua E2
  • lavavajillas Candy 2 parpadeos
  • lavavajillas Candy no coge agua
  • lavavajillas Haier no coge agua
  • Meaco dehumidifier E2 humidity sensor
  • Meaco E2
  • MeacoDry Arete E2
  • NO WATER
  • Samsung E2 desagüe
  • Samsung E2 drain error
  • Samsung E2 water left in drum
  • Samsung lavadora E2
  • Samsung washer error E2
  • Samsung washer not draining E2
  • Samsung washing machine E2
  • Worcester boiler E2 fault
  • Worcester Bosch E2
  • Worcester E2

What it means

In its air conditioner error code table, Haier defines E2 as "pipe temperature sensor failure". According to Haier, these codes may be caused by damaged parts and can only be solved by its after-sales engineers. The table is from Haier Pakistan; other models and markets may differ. The code alone never proves which part is faulty: the sensor is measured before it is replaced.

Warnings and stop conditions

  • Mediumsource verified

    Haier says these codes can only be solved by its after-sales engineers and cannot be fixed by the customer: switch the unit off and call Haier service. Do not open the casing; there is mains voltage inside.

    Evidence: Haier: How to do if display shows error code? Such as "E7" or "F8"

Symptoms and causes

Probable causes · in order

  • Pipe temperature sensorPossible

    This is the component Haier names for E2. It is confirmed by measuring it against the manufacturer's specification with the unit powered off.

    Evidence: Haier: How to do if display shows error code? Such as "E7" or "F8"

  • Sensor connection or boardPossible

    If the sensor measures correctly, the reading fails at its connection or in the control; then replacing the sensor is not justified.

    Evidence: Haier: How to do if display shows error code? Such as "E7" or "F8"

Virtual technician

Does E2 still appear after these checks?

Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.

Start diagnosis

Sources and technical references

  1. 1

    Haier: How to do if display shows error code? Such as "E7" or "F8"

    Haier · 2016 · official_doc

Sources: Haier: How to do if display shows error code? Such as "E7" or "F8"reviewed 2026-10-04 · verified

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