Haier mini split error code 27
IPM current detection circuit malfunction.
- TypeFault
- SystemControl board
- Can I fix it?Technician job
What 27 means on a Haier
The current-sensing circuit on the inverter module is returning an impossible value.
On this platform, 27 is a fault: something has failed or is disconnected and needs diagnosis.
Common causes
- A failed IPM or 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.
- 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.
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-level fault.
Which Haier units show 27
This page applies to Haier Haier Flexfit multi-zone (2U/3U/4U…MS2HDA) units. Haier's own documentation lists 27 as "IPM current detection circuit malfunction", 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 27:
27 on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- GE Appliances 27 IPM current detection circuit malfunction
Questions people ask
Can I reset a Haier 27 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If 27 comes back, the fault is real and needs the checks above.
Is it safe to keep running a Haier showing 27?
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 27?
Board-level fault. 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.