Haier Error Codes & Diagnostics
Complete diagnostic directory for official Haier fault codes. Verify root causes, safe troubleshooting steps, and replacement part numbers before calling a technician.
Haier E5: overcurrent stops are as much about the supply as the unit
Haier uses E5 for an overcurrent condition, meaning the current drawn exceeded what the control permits. Current is a product of the work being demanded and the voltage available to do it, so a low or unstable supply produces the same code as a compressor that is hard to turn. Applies to: Haier residential split air conditioners documented in the Haier service and resource library This applies to Haier residential split equipment documented in the Haier service library. Haier manufactures for several brand programmes, and units sold under other names may use a different code set even where hardware overlaps. Confirm against the manual issued with your own unit. Owner-safe checks: Make one start attempt and note how long the outdoor unit runs before the code returns. | Watch whether household lighting reacts at the moment of start, and note the time of day each occurrence happens. | Confirm no protective device in the consumer unit or panel has operated, and that the unit is on the supply arrangement it was installed with. Qualified technician: Measuring supply voltage under starting load, testing compressor windings, and assessing the drive are energised tasks for a qualified person. | A protective device that trips when the unit starts, a burning smell, or heat at an isolator means leaving the supply off and arranging an electrical inspection before anything else.
Haier Forward Series E7 communication fault
On Haier Forward Series systems, indoor code E7 identifies a communication failure between the indoor and outdoor units; the outdoor diagnostic can report the same condition with 15 flashes. Wiring, connections, supply, and either control end remain candidates until the communication path is tested. Applies to: Forward Series This definition comes from Haier's North American Forward Series service manual. Other Haier families reuse E7 for different conditions, so the series and both model labels must match before this meaning is applied. Owner-safe checks: Save the indoor display, both rating plates, whether the system ever ran, and the timing of any outage, storm, installation, or repair. Qualified technician: Outdoor flash observation behind a cover, cable tests, terminal correction, voltage measurement, and board diagnosis belong to qualified service.
Haier Forward F11 and F28: compressor position not detected
Both codes report that the position of the compressor rotor cannot be detected normally. The service manual gives the decision conditions as compressor wiring that is wrong or poorly connected, or a damaged compressor, so the code covers a wide range of repair. Applies to: Forward Series systems in the manufacturer service manual This follows the Haier service manual for the Forward Series, where the codes appear as indoor display F11 and F28 alongside outdoor LED1 flash counts of 18 and 19. Haier assigns codes by product family, and the Forward Series is documented in its own literature, so confirm the range before applying these meanings. Owner-safe checks: Photograph the indoor display, or count two complete flash cycles at the outdoor board and write the number down. | Record whether any work has been done at the outdoor unit, and by whom, since the system last ran normally. | Note whether the outdoor fan turns at all when the system is asked to start, without opening any panel. Qualified technician: Compressor terminals, drive circuits, and winding measurements are technician work with the supply isolated and the capacitors discharged. | Ask for the compressor to be tested rather than inferred, because the manual lists wiring and a damaged compressor as alternatives under the same code.