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117 PB
TROUBLESHOOTING
Diagnostic Codes
No. Malfunction
Name
Display Method of Indoor Unit Display Method of Outdoor Unit A/C status Possible Causes
Dual‑8
Code
Display
Indicator Display (During blinking,
ON 0.5s and OFF 0.5s)
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and
OFF 0.5s
Power
Indicator
Cool
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
48 zero crossing
malfunction
of outdoor
unit
U9 OFF 3s
and blink
18 times
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation.
Replace outdoor control
panel AP1
49 frequency
limiting
(power)
OFF 1 and
blink 13
times
50 compressor
running
OFF 1s
and blink
13 times
51 the tem‑
perature for
turning on
the unit is
reached
OFF 1s
and blink
8 times
52 frequency
limiting
(module
tempera‑
ture)
OFF 1s
and blink
11 times
53 normal com‑
munication
OFF 0.5s
and blink
once
54 defrosting H1 OFF 3s
and blink
once
(during
blinking,
ON 10S
AND OFF
0.5S
OFF 1s
and blink
twice
Defrosting will occur in
heating
mode. Compressor will
operate
while indoor fan will stop
operation.
Its the normal state
55 malfunc‑
tion of
zero‑cross
detection
circuit
U8 The Complete Unit Stops 1. Power supply is
abnormal
2. Detection circuit of
indoor control mainboard
is abnormal.
56 Malfunction
of detecting
plate (WIFI)
JF
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