Friedrich MRM09Y1J, Service & Parts Manual

Page: 83 / 135

83 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
1 High
Pressure
Protectioon
Of System
E1 OFF 3s
and blink
once
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation.
During heating operation,
the complete unit stops.
Possible reasons:
1.Refrigerant was super -
abundant;
2.Poor heat exchange (in -
cluding filth blockage of
heat exchanger and bad
radiating environment );
Ambient temperature is
too high.
2 Antifreezing
protection E2 OFF 3s
and blink
twice
OFF 1 s
and blink
3 times
During cooling and drying
operation, compressor
and outdoor fan stop while
indoor fan operates. 1.Poor air-return in indoor
unit;
2.Fan speed is abnormal;
3.Evaporator is dirty.
3 In Defect of
refrigerant F0 OFF 1 s
and blink
9 times
The Dual-8 Code Display
will show F0 and the com
-
plete unit stops.
1.In defect of refrigerant;
2.Indoor evaporator
temperature sensor works
abnormally;
3. The unit has been
plugged up somewhere.
4 High Dis -
charge tem -
peraature
protection of
compressor
E4 OFF 3s
and blink
4 times
OFF 1s
and blink
7 times
During cooling and drying
operation, compressor
and outdoor fan stop while
indoor fan operates. During
heating operation, all loads
stop. Please refer to the mal-
function analysis (discharge
protection, overload).
5 Overcurrent
protection E5 OFF 3s
and blink
6 times
OFF 1s
and blink
5 times
During cooling operation,
compressor stops while
indoor fan motor operates.
During heating operation,
the complete unit stops. 1. Supply voltage is
unstable;
2. Supply voltage is too low
andload is too high;
3. Evaporator is dirty.
6 Commu-
nication
malfunction
E6 OFF 3s
and blink
6 times
Always on During cooling opera -
tion, compressor stops
while indoor fan motor
operates. During heating
operation, the complete
unit stops.
Refer to the correspond -
ing malfunction analysis.
7 High
temperature
resistant
prtoection
E8 OFF 3s
and blink
8 times
OFF 1s
and blink
6 times
During cooling operation:
compressor will stop while
indoor fan will operate.
During heating operation,
the complete unit stops. Refer to the malfunction
analysis (overload, high
temperature resistant).
8 EEPROM
malfunction
EE OFF 3s
and blink
15 times
OFF 1s
and blink
11 times
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