mypros+
Error code reference

Haier Air Conditioner Error Code E13

Low voltage input

Haier codesHaier air conditioner codes

Low voltage input - possible low voltage or damaged control board (Power OFF, Timing blinking, Running ON)

First step from the service manual

Check input voltage and control board

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

MyPros+ Max

Get the full diagnostic procedure for E13.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E13 means on a Haier air conditioner

The E13 error code on a Haier air conditioner indicates a low voltage input condition detected by the control board. This fault triggers a specific indicator pattern: the Power LED remains ON, the Timing LED blinks, and the Running LED stays ON. The control board continuously monitors incoming supply voltage, and when that voltage drops below the acceptable operating threshold, the unit registers E13 to prevent operation under conditions that could damage internal components.

Low input voltage is a supply-side issue that originates either from the electrical infrastructure feeding the unit or from a failure within the control board itself. A weakened utility supply, an overloaded circuit, a failing breaker, or degraded wiring between the disconnect and the unit can all reduce the voltage reaching the control board below the required level. In some cases, the control board's voltage sensing circuit becomes faulty and reports a low voltage condition even when the actual supply voltage is within normal range.

Diagnosis should begin with measuring the actual input voltage at the unit's terminal block using a multimeter while the unit is attempting to run. If the measured voltage is within the acceptable range for the unit's rated supply but E13 persists, the control board's sensing circuitry is the likely culprit. If measured voltage is genuinely low, tracing the issue upstream through the circuit, wiring, and utility supply is the correct path before any board replacement is considered.

Source: manufacturer service documentation.

Common causes of E13

  1. 01

    Low utility or supply voltage

    Wiring / connection

    The incoming voltage from the power grid or home wiring is below the unit's required operating range. Check voltage at the unit's terminal block with a multimeter during attempted operation to confirm.

  2. 02

    Overloaded or undersized circuit

    Wiring / connection

    Sharing a circuit with other high-draw appliances can cause voltage to sag below acceptable levels under load. Verify the air conditioner is on a dedicated circuit sized appropriately for its amperage rating.

  3. 03

    Degraded or loose wiring connections

    Wiring / connection

    Corroded terminals, loose connections at the disconnect box, or damaged supply wiring can create resistance that drops the effective voltage reaching the unit. Inspect all wiring from the panel to the unit's terminal block.

  4. 04

    Faulty or failing circuit breaker

    Part replacement

    A breaker that is beginning to fail can allow voltage to pass but at a reduced level, particularly under load. If voltage tests low only when the unit is running, the breaker is a strong suspect.

  5. 05

    Damaged control board

    Part replacement

    If input voltage measures correctly at the terminal block but E13 persists, the control board's internal voltage sensing circuit may be defective. Replacing the control board is required to resolve this scenario.

See the test procedure for each cause

Frequently asked questions about E13

What does E13 mean on a Haier air conditioner?
E13 on a Haier air conditioner indicates a low voltage input fault. The unit's control board has detected that the incoming electrical supply voltage is below the required operating threshold. The fault is signaled by the Power LED staying on, the Timing LED blinking, and the Running LED staying on. The root cause is either a genuine supply voltage problem or a damaged control board.
How do I fix an E13 error on my Haier air conditioner?
Start by measuring the input voltage at the unit's terminal block with a multimeter while the unit attempts to operate. If voltage is low, investigate the circuit, breaker, and wiring upstream from the unit. If the voltage is within the correct range but the error persists, the control board is likely faulty and will need to be replaced by a qualified technician.
Is it safe to keep running my Haier air conditioner when E13 appears?
No, you should not continue operating the unit while E13 is active. Low input voltage can cause the compressor and other components to draw excessive current, leading to overheating and premature failure of internal parts. The unit's shutdown response to this error is a protective measure, and the underlying cause should be corrected before resuming operation.
Will resetting my Haier air conditioner clear the E13 error?
A power cycle reset may temporarily clear the E13 display, but the error will return if the underlying cause is not resolved. If the supply voltage remains low or the control board remains faulty, the fault condition will be detected again as soon as the unit attempts to operate. Resetting without diagnosis is not a fix.
How much does it cost to repair an E13 error on a Haier air conditioner?
Repair costs depend on the root cause. If the issue is a faulty breaker or wiring problem, electrical repair costs typically range from around 100 to 300 dollars depending on the scope of work. Control board replacement, if that is the diagnosed cause, generally ranges from 150 to 400 dollars or more including labor, depending on the specific model and service rates in your area.

Related Haier air conditioner codes

All Haier air conditioner codes
View all 47 Haier air conditioner codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass