113
Fault Displays
Models GWH18MC-D3DNA3D & GWH24MD-D3DNA3D
Malfunction
Name
Indoor Unit Displaying Method
Outdoor Unit Display (LED)
A/C Status
Malfunctions
Dual-8
Code
Display
Indicator Display (during blink-
ing, ON 0.5s and OFF 0.5s
Indicator has 3 kinds of display status and
during blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
Heating
LED
D40/D5
D41/D6
D42/D16 D43/D30
Module
sensor circuit
diagram
P7
OFF 3S
and blink
18 times
o
o
n
Module temp
over high
protection
P8
OFF 3S
and blink
19 times
n
o
¶
n
DC Bus volt-
age dips
U3
OFF 3S
and blink
20 times
o
n
n
n
Low DC Bus
voltage pro-
tection
PL
OFF 3S
and blink
21 times
o
n
n
o
IPM temp
is too high
limit/decrease
frequency
EU
n
n
n
¶
Four-way
valve abnor-
mal
U7
n
o
¶
o
Outdoor unit
zero-cross de-
tecting error
U9
n
n
¶
o
Anti-freezing
limit/decrease
frequency
FH
n
n
n
o
All loads
work nor-
mally but
the running
frequency
limited or
decrease
Indoor unit air
return is poor
or fan speed is
too low
Fan mode
protection
L3
n
o
o
o
Cooling:
outdoor
fan motor,
compressor
stop run-
ning; indoor
fan works.
Heating:
outdoor fan,
compressor,
indoor fan
motor stop
running.
1. The wire
terminal of
outdoor fan
motor is loose,
repair connec-
tion 2. Motor
damaged,
replace the
motor. 3. Fan
motor module
on mainboard
is defective, re-
place the main
board AP1