Haier ductless-mini-split — Forward Series systems in the manufacturer service manual Error Codes Directory

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.