Haier mini split error code 1

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:

All Haier error codes

1 on other brands

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

• Hisense 1 Outdoor coil temperature sensor fault (open or short circuit)
• GE Appliances 1 Outdoor PCB EEPROM fault