Friedrich MRM09Y1J, Service & Parts Manual

Page: 87 / 135

87 PB
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
23 compres -
sor min
frequence in
test state
P0 during
blinking
ON 0.25s
and OFF
0.25s
during
blinking
ON 0.25s
and OFF
0.25s
Showing during nominal
cooling or nominal heating
test
24 compres -
sor rated
frequence in
test state
P1 during
blink -
ing ON
0.25s
and OFF
0.25s
during
blinking
ON 0.25s
and OFF
0.25s
Showing during middle
cooling or middle heating
test
25 compressor
maximum
frequence in
test state
P2 during
blinking
ON and
0.25s and
OFF and
0.25s
during
blinking
ON and
0.25s and
OFF and
0.25s
Showing during max. cool -
ing or max. heating test
26 compressor
intermediate
frequence in
test state
P3 during
blinking
ON and
0.25s and
OFF and
0.25s
during
blinking
ON and
0.25s and
OFF and
0.25s
Showing during middle
cooling or middle heating
test
27 overcurrent
protection
of phase
current for
compressor P5 OFF 3s
and blink
15 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).
28 charging
malfunction
of capacitor PU OFF 3s
and blink
17 times
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete unit
will stop Refer to the part three—
charging malfunction
analysis of capacitor
29 malfunction
of module
temperature
sensor
circuit
P7 OFF 3s
and blink
18 times
s During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete unit
will stop Replace outdoor control
panel AP1
TROUBLESHOOTING
Diagnostic Codes