74
#
Malfunction
Name
Indoor Unit Display
Method
Outdoor Unit
Display Method
(repeated every 5
seconds)
o
= Off
n
= Illuminated
«
= Blink
A/C Status
Possible Causes
Indoor
Display
Heating
Indicator
20 Defrosting
H1
Off 3S and
blink once
Defrosting will occur in
heating mode. Compressor
will operate while indoor fan
will stop operation
It’s the normal state
21 Static dedusting
protection
H2
Off 3S and
blink twice
22 Overload
protection for
compressor
H3
Off 3s and
blink 3 times
o
«
«
o
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
1. Wiring terminal OVC-
COMP is loosened. In
normal state, the resistance
for this terminal should be
less than 1ohm; 2. Refer
to the malfunction analy-
sis (discharge protection,
overload)
23 System is abnor-
mal
H4
Off 3s and
blink 4 times
n
o
n
n
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
Refer to the malfunction
analysis (IPM protec-
tion, loss of synchronism
protection and overcurrent
protection of phase current
for compressor.
24 IPM protection H5
Off 3s and
blink 5 times
o
«
o
n
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
Refer to the malfunction
analysis (IPM protec-
tion, loss of synchronism
protection and overcurrent
protection of phase current
for compressor.
25 PFC protection
HC
Off 3s and
blink 6 times
o
n
«
«
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
Refer to the malfunction
analysis
26 Desynchroniz-
ing of compres-
sor
H7
Off 3s and
blink 7 times
o
«
n
«
During cooling and drying
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
Refer to the malfunction
analysis (IPM protec-
tion, loss of synchronism
protection and overcurrent
protection of phase current
for compressor.
Troubleshooting 18,000/24,000 btuh Units, cont.
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