Friedrich MRM09Y1J, Service & Parts Manual

Page: 88 / 135

88 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
Indica -
tor
Heating
Indicator Yellow
Indicator Red Indi-
cator
Green
Indicator
30 module high
temperature
protection P8 OFF 3s
and blink
19 times
During cooling operation,
compressor will stop while
indoor fan will operate;
During heating operation,
the complete unit will stop After the complete unit is
de-energized for 20mins,
check whether the thermal
grease on IPM Module of
outdoor control panel AP is
sufficient and whether the
radiator is inserted tightly.
If no faults found, replace
control panel AP1
31 decrease
frequency
due to high
temperature
resistant
during
heating
operation
H0 OFF 3s
and blink
10 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction
analysis (overload, high
temperature resistant)
32 static
dedusting
protection H2 OFF 3s
and blink
twice
33 overload
protection
for com -
pressor
H3 OFF 3s
and blink
3 times
OFF 1s
and blink
8 times
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
analysis ( discharge protec
-
tion, overload)
34 system is
abnormal H4 OFF
3s and
blink 4
times
OFF 1s
and blink
6 times
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 (overload, high
temperature resistant)
35 IPM protec -
tion
H5 OFF
3S and
blink 5
times
OFF 1s
and blink
4 times
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.