Troubleshooting; Diagnostic Codes - Friedrich MWM09Y1J Service & Parts Manual

TROUBLESHOOTING

Diagnostic Codes

No. Malfunction Display Method of Indoor Unit
Name
Dual-8
Code
Display
1 High E1
Pressure
Protectioon
Of System
2 Antifreezing E2
protection
3 In Defect of F0
refrigerant
4 High Dis- E4
charge tem-
peraature
protection of
compressor
5 Overcurrent E5
protection
6 Commu- E6
nication
malfunction
7 High E8
temperature
resistant
prtoection
8 EEPROM EE
malfunction
83
Indicator Display (During blinking,
ON 0.5s and OFF 0.5s)
Power Cool Heating
Indicator Indica- Indicator
tor
OFF 3s
and blink
once
OFF 3s
and blink
twice
OFF 3s
and blink
4 times
OFF 3s
and blink
6 times
OFF 3s
and blink
6 times
OFF 3s
and blink
8 times
OFF 3s
and blink
15 times
Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5s and OFF 0.5s
Yellow Red Indi- Green
Indicator cator Indicator
OFF 1 s
and blink
3 times
OFF 1 s
and blink
9 times
OFF 1s
and blink
7 times
OFF 1s
and blink
5 times
Always on
OFF 1s
and blink
6 times
OFF 1s
and blink
11 times
A/C status Possible Causes
During cooling and drying Possible reasons:
1.Refrigerant was super-
operation, except indoor
abundant;
fan operates, all loads stop
2.Poor heat exchange (in-
cluding filth blockage of
operation.
heat exchanger and bad
During heating operation,
radiating environment );
Ambient temperature is
the complete unit stops.
too high.
During cooling and drying 1.Poor air-return in indoor
operation, compressor unit;
and outdoor fan stop while 2.Fan speed is abnormal;
indoor fan operates. 3.Evaporator is dirty.
The Dual-8 Code Display 1.In defect of refrigerant;
will show F0 and the com- 2.Indoor evaporator
plete unit stops. temperature sensor works
abnormally;
3. The unit has been
plugged up somewhere.
During cooling and drying Please refer to the mal-
operation, compressor function analysis (discharge
and outdoor fan stop while protection, overload).
indoor fan operates. During
heating operation, all loads
stop.
During cooling operation, 1. Supply voltage is
compressor stops while unstable;
indoor fan motor operates. 2. Supply voltage is too low
During heating operation, andload is too high;
the complete unit stops. 3. Evaporator is dirty.
During cooling opera- Refer to the correspond-
tion, compressor stops ing malfunction analysis.
while indoor fan motor
operates. During heating
operation, the complete
unit stops.
During cooling operation: Refer to the malfunction
compressor will stop while analysis (overload, high
indoor fan will operate. temperature resistant).
During heating operation,
the complete unit stops.
During cooling and drying Replace outdoor control
operation, compressor will panel AP1
stop while indoor fan will
operate; During heating
operation, the complete unit
will stop