Haier · Split air conditioners · Haier Flexis Plus (wall-mounted split, R32)
E7Communication fault between indoor and outdoor units
Name in the manufacturer's documentation (service manual): Communication fault between indoor and outdoor units
[1]
In plain words (editorial)
Communication fault between the indoor and outdoor units. The service manual lists a disconnected communication wire or a broken indoor, outdoor or module PCB; it starts by restarting the air conditioner.
When to call a service technician: If the code returns after a restart, call a service technician.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Detection conditions (source text)
- Communication is detected by checking the indoor PCB and the outdoor PCB.[2]
Possible causes (source text)
Steps given by the manufacturer (source text)
- Restart the air conditioner; if it becomes normal, the outdoor mainboard needs dehumidification; if the fault returns after a while, the outdoor mainboard needs dedust.[7]
- Check whether the linking cable between the indoor and outdoor units is well connected, its core wires are well insulated and L/N is not reversed; reconnect or replace the linking cable.[8]
Safety notes from the documentation
- Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred.[9]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →
Sources
Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.
- [1] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 29 official manufacturer document quote verified
Communication fault between
- [2] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
Communication is detected by checking the indoor PCB and the outdoor PCB.
- [3] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
Communication wiring disconnected.
- [4] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
The indoor PCB is broken.
- [5] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
The outdoor PCB is broken.
- [6] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
The Module PCB is broken.
- [7] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
Restart the a/c and it
- [8] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
Reconnect the linking
- [9] Haier – Service Manual, Model AS35S2SF1FA-BH (Flexis Plus), Version V1, 2020-11-14 (V1 (2020-11-14)) , p. 38 official manufacturer document quote verified
Be sure to turn off power switch before connect or disconnect connector