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Error code reference

Haier Air Conditioner Error Code Power■ Timer■ Running★

Transmission abnormity

Haier codesHaier air conditioner codes

Transmission abnormity — outdoor unit cannot receive signals within 20 seconds after indoor unit sending (except first 2 minutes after power on).

First step from the service manual

Check for great interference source around; verify correct wire connection or check if control board is not good.

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

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What Power■ Timer■ Running★ means on a Haier air conditioner

The Power, Timer, and Running indicator pattern on a Haier air conditioner signals a communication fault between the indoor and outdoor units. Specifically, the indoor unit is transmitting control signals but the outdoor unit fails to receive them within a 20-second window. The system monitors this communication link continuously after the initial 2-minute startup grace period, which exists to allow both units to fully initialize. Once that window closes, if the signal handshake is not established, the error is triggered and normal operation halts.

This fault is classified as a transmission abnormality, meaning the issue lies in the data pathway between the two units rather than in the refrigeration or electrical power systems directly. The communication link typically runs through a dedicated control wire in the interconnecting cable between indoor and outdoor units. A break, loose connection, incorrect wiring, or corroded terminal on that signal wire can interrupt the data stream entirely. In some cases, strong electromagnetic interference from nearby equipment such as variable frequency drives, large motors, or fluorescent lighting can corrupt the signal enough to prevent reliable communication.

The indoor or outdoor control board itself may also be the root cause if wiring checks out and no interference sources are present. A failed communication circuit on either board will produce the same result. Diagnosis should follow a structured path: inspect the interconnecting wiring first, eliminate nearby interference sources, then evaluate the control boards. Given the 20-second timeout window built into the system, intermittent contact or borderline signal corruption may cause the fault to appear inconsistently rather than on every startup.

Source: manufacturer service documentation.

Common causes of Power■ Timer■ Running★

  1. 01

    Loose or faulty communication wiring

    Wiring / connection

    The signal wire connecting the indoor and outdoor units may be loose at a terminal, incorrectly connected, or damaged along its run. Inspect all terminals on both the indoor and outdoor control boards for secure, corrosion-free connections.

  2. 02

    Electromagnetic interference from nearby equipment

    Wiring / connection

    Strong interference sources such as large motors, variable frequency drives, or other high-power electrical equipment near the unit can disrupt the communication signal. Identifying and relocating or shielding such sources may resolve the fault.

  3. 03

    Outdoor unit control board failure

    Part replacement

    If the outdoor control board's communication circuit has failed, it will not receive signals from the indoor unit regardless of wiring condition. This is typically confirmed after wiring and interference checks come back clean.

  4. 04

    Indoor unit control board failure

    Part replacement

    A fault in the indoor control board's transmitting circuit means signals are never sent correctly, triggering the same communication timeout. This is diagnosed after ruling out wiring and outdoor board issues.

  5. 05

    Incorrect wiring configuration

    Wiring / connection

    If the interconnecting cable was recently disturbed or installed, wires may be connected to incorrect terminals. Verify that the wiring matches the correct terminal assignments on both the indoor and outdoor units.

See the test procedure for each cause

Frequently asked questions about Power■ Timer■ Running★

What does Power■ Timer■ Running★ mean on a Haier air_conditioner?
This indicator combination signals a transmission abnormality between the indoor and outdoor units. The indoor unit is sending control signals but the outdoor unit does not receive them within 20 seconds. The system excludes the first 2 minutes after power-on from this check to allow startup to complete. Once the fault is detected, normal operation is suspended until the communication issue is resolved.
How do I fix the communication error on my Haier air conditioner?
Start by inspecting the wiring between the indoor and outdoor units, checking for loose terminals, incorrect connections, or visible wire damage. Also look for large electrical appliances or equipment near the units that could be causing interference. If the wiring appears correct and no interference sources are found, the indoor or outdoor control board may need to be tested and possibly replaced.
Will resetting my Haier air conditioner clear this error?
A power reset may temporarily clear the fault display, but if the underlying cause is not corrected the error will return once the 20-second communication timeout elapses again after startup. Resetting is useful for confirming whether the fault is intermittent or constant, but it is not a fix on its own. The root cause in the wiring or control boards must be addressed for the unit to operate normally.
Is it safe to keep running my air conditioner when this error appears?
When this fault is active, the system typically stops normal operation to protect itself, so the unit will not be cooling effectively. Attempting to force operation in this state is not recommended, as the outdoor unit is not receiving proper control signals. It is best to leave the system off until the communication fault is diagnosed and corrected.
How much does it cost to repair a Haier air conditioner communication fault?
If the fix involves only a wiring correction or tightening a loose terminal, the cost is primarily a service call fee, typically in the range of $75 to $150. If a control board needs to be replaced, the total cost including parts and labor generally falls between $200 and $600 depending on the specific board and labor rates in your area. Getting a diagnostic inspection first is the best way to understand what is needed before committing to a repair.

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