DIY HVAC Tools

Haier mini split error code 1

Outdoor PCB EEPROM fault. Also shown as 01.

  • TypeFault
  • SystemControl board
  • Can I fix it?Technician job

What 1 means on a Haier

The outdoor control board could not read its stored parameters.

On this platform, 1 is a fault: something has failed or is disconnected and needs diagnosis.

Common causes

  • A surge or lightning event.
  • A failed outdoor board.

How to fix it yourself

Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.

  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.

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

Board replacement by a technician.

Which Haier units show 1

This page applies to Haier Haier Flexfit multi-zone (2U/3U/4U…MS2HDA) units. Haier's own documentation lists 1 as "Outdoor PCB EEPROM fault", the same definition used across the Haier / GE multi-zone outdoor display 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 Haier shows this code

These numeric codes show on the Service Monitor Board display inside the multi-zone OUTDOOR unit (behind the service panel). The indoor units signal a fault with blinking lamps; the number on the outdoor board is what identifies it. Codes 1 to 27 are outdoor-unit faults and protections, 28 to 41 are temperature sensors (28 to 31 and 40 are zone liquid-pipe sensors, 32 to 36 are zone gas-pipe sensors), and 42 to 45 are pressure switches and limits.

Other Haier codes

Same part of the system as 1:

26Outdoor PCB reset27IPM current detection circuit malfunction38IPM temperature sensor fault or momentary power failure detected
2IPM (inverter power module) fault4Communication failure between IPM and outdoor PCB5Compressor overload protection6Unreliable power input (voltage protection)8Compressor discharge temperature too high9Outdoor fan motor fault10Defrost (outdoor coil) temperature sensor fault (open or short circuit)11Compressor suction temperature sensor fault (open or short circuit)

All Haier error codes

1 on other brands

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

Questions people ask

Can I reset a Haier 1 code myself?

Yes. Turn the system off at the breaker for five minutes, then restart it. If 1 comes back, the fault is real and needs the checks above.

Is it safe to keep running a Haier showing 1?

The unit will usually refuse to run, or run with reduced output, until the fault is cleared. Repeated resets do not fix anything and can mask a problem that is getting worse.

What will a technician check for 1?

Board replacement by a technician. Ask for the measurements, not just a parts quote.

Sources

  • Haier / GE Ductless Multi-Split Heat Pump Service Manual (4.11.22), Error Codes table

Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.