Air-Con Multi Split

This is the support page for the Air-Con multi split line. Here you will find information pertaining to common issues with the multi split units.

Indoor Units

• A16EM4H4R09
• A16EM4H4R12
• A16EM4H4R18

Outdoor Units

• A16CM4H4R18
• A16CM4H4R24
• A16CM4H4R36
• A16CM4H4R39

Malfunction Indicators

NO.	Malfunction description	LED1	LED2	LED3	LED4
0	Normal stop	off	off	off	off
1	Compressor run	on	off	off	off
2	Compressor overload protection	blinking	off	off	off
3	Discharge protection	off	on	off	off
4	Outdoor unit overload protection	on	on	off	off
5	High pressure protection	blinking	on	off	off
6	Over current protection	off	blinking	off	off
7	IMP protection	on	blinking	off	off
8	IMP overheating protection	blinking	blinking	off	off
9	PFC protection (including PFC overheating protection)	off	off	on	off
10	Phase current protection	on	off	on	off
11	Over voltage protection	blinking	off	on	off
12	Insufficient voltage protection	off	on	on	off
13	Start failure	on	on	on	off
14	Compressor desynchronizing	blinking	on	on	off
15	Compressor phase-lacking protection	off	blinking	on	off
16	Compressor phase current detection malfunction	on	blinking	on	off
17	Memory chip mistake	blinking	blinking	on	off
18	DC power supply short-circuit	off	off	blinking	off
19	Defrosting	on	off	blinking	off
20	Oil return	blinking	off	blinking	off
21	Complete unit frequency restriction protection	off	on	blinking	off
22	Complete unit frequency dropping protection	on	on	blinking	off
23	Unit A frequency restriction or frequency dropping protection	blinking	on	blinking	off
24	Unit B frequency restriction or frequency dropping protection	off	blinking	blinking	off
25	Unit C frequency restriction or frequency dropping protection	on	blinking	blinking	off
26	Unit D frequency restriction or frequency dropping protection	blinking	blinking	blinking	off
27	Outdoor ambient temperature sensor protection	off	off	off	on
28	Outdoor tube temperature sensor protection	on	off	off	on
29	Discharge temperature sensor protection	blinking	off	off	on
30	IPM thermal resistance malfunction	off	on	off	on
31	Unit A liquid pipe temperature sensor malfunction	on	on	off	on
32	Unit A gas pipe temperature sensor malfunction	blinking	on	off	on
33	Unit B liquid pipe temperature sensor malfunction	off	blinking	off	on
34	Unit B gas pipe temperature sensor malfunction	on	blinking	off	on
35	Unit C liquid pipe temperature sensor malfunction	blinking	blinking	off	on
36	Unit C gas pipe temperature sensor malfunction	off	off	on	on
37	Unit D liquid pipe temperature sensor malfunction	on	off	on	on
38	Unit D gas pipe temperature sensor malfunction	blinking	off	on	on
39	Unit A mode conflict	off	on	on	on
40	Unit B mode conflict	on	on	on	on
41	Unit C mode conflict	blinking	on	on	on
42	Unit D mode conflict	off	blinking	on	on
43	Communication failure with Unit A	on	blinking	on	on
44	Communication failure with Unit B	blinking	blinking	on	on
45	Communication failure with Unit C	off	off	blinking	on
46	Communication failure with Unit D	on	off	blinking	on
47	Unit A freeze protection	blinking	off	blinking	on
48	Unit B freeze protection	off	on	blinking	on
49	Unit C freeze protection	on	on	blinking	on
50	Unit D freeze protection	blinking	on	blinking	on
51	Unit A overheating prevention protection	off	blinking	blinking	on
52	Unit B overheating prevention protection	on	blinking	blinking	on
53	Unit C overheating prevention protection	blinking	blinking	blinking	on
54	Unit D overheating prevention protection	off	off	off	blinking
55	Unit A communication wire misconnection or expansion valve malfunction	on	off	off	blinking
56	Unit B communication wire misconnection or expansion valve malfunction	blinking	off	off	blinking
57	Unit C communication wire misconnection or expansion valve malfunction	off	on	off	blinking
58	Unit D communication wire misconnection or expansion valve malfunction	on	on	off	blinking