Mitsubishi Electric PUZ-ZM35VKA Service Manual page 73

Indication
Outdoor controller
board
LED1 (Green) LED2 (Red)
3 blinking 1 blinking Abnormality of shell thermistor(TH33)
and discharging temperature (TH4)
Abnormality of superheat due
to low discharge temperature
2 blinking Abnormal high pressure (High
pressure switch 63H operated.)
3 blinking Abnormality of outdoor fan
motor rotational speed
Protection from overheat operation(TH3)
4 blinking Compressor overcurrent
breaking(Start-up locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
5 blinking Open/short of discharge thermistor (TH4)
and comp. surface thermistor (TH32)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
6 blinking Abnormality of heatsink
temperature
7 blinking Abnormality of voltage
4 blinking 1 blinking Abnormality of room temperature thermistor (TH1)
Abnormality of pipe temperature thermistor /Liquid (TH2)
Abnormality of pipe temperature
thermistor/Condenser-Evaporator
2 blinking Abnormality of drain sensor (DS)
Float switch(FS) connector open
Indoor drain overflow protection
Leakage error (refrigerant system)
3 blinking Freezing (cooling)/overheating (heating)
protection
4 blinking Abnormality of pipe temperature
5 blinking Indoor unit fan motor error
*1 Check code displayed on remote controller
*2 Refer to the indoor unit's service manual.
OCH653
Check
Contents
code *1
U2
U7
U1
U8
Ud
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P4
P5
PA
P6
P8
PB(Pb) Defective fan motor winding
73
Error
Inspection method
1Check if stop valves are open.
2Check if connectors (TH4, TH33, LEV-A, and LEV-B)
on outdoor controller board are not disconnected.
3Check if unit is filled with specified amount of refrigerant.
4Measure resistance values among terminals on indoor
valve and outdoor linear expansion valve using a tester
1Check if indoor/outdoor units have a short cycle on their air ducts.
2Check if connector (63H) on outdoor controller
board is not disconnected.
3Check if heat exchanger and filter is not dirty.
4Measure resistance values among terminals on
linear expansion valve using a tester.
1Check the outdoor fan motor.
2Check if connector (TH3) on outdoor controller
board is disconnected.
1Check if stop valves are open.
2Check looseness, disconnection, and converse
connection of compressor wiring.
3Measure resistance values among terminals on
compressor using a tester.
4Check if outdoor unit has a short cycle on its air duct.
1Check if connectors(TH3,TH4,TH6 ,TH7 and TH32)on outdoor
controller board and connector (CN3) on outdoor power board
are not disconnected.
2Measure resistance value of outdoor thermistors.
1Check if indoor/outdoor units have a short cycle
on their air ducts.
2Measure resistance value of outdoor
thermistor(TH8).
1Check looseness, disconnection, and converse
connection of compressor wiring.
2Measure resistance value among terminals on
compressor using a tester.
3Check if power supply voltage decreases.
4Check the wiring of CN52C.
1Check if connectors (CN20, CN21, CN29
and CN44) on indoor controller board are not
disconnected.
2Measure resistance value of indoor thermistors.
1Check if connector (CN31)(CN4F) on indoor
controller board is not disconnected.
2Measure resistance value of indoor thermistors.
3Measure resistance value among terminals on
drain pump using a tester.
4Check if drain pump works.
5Check drain function.
1Converse connection of piping or wiring
Note: The error will be cancelled by turning off
power, and on again.
2Check if there are any inclination or clogging in drain pipe.
3Check if drain pan or drain sensor is dirty.
4Check if any foreign matter is attached to the
moving part of float switch.
5Check LEV for proper function.
1Check if indoor unit has a short cycle on its air duct.
2Check if heat exchanger and filter is not dirty.
3Measure resistance value on indoor and outdoor fan motors.
4Check if the inside of refrigerant piping is not clogged.
1Check if indoor thermistors(TH2 and TH5) are not
disconnected from holder.
2Check if stop valve is open.
3Check converse connection of extension pipe. (on
plural units connection)
4Check if indoor/outdoor connecting wire is
connected correctly. (on plural units connection)
Detailed
reference
page
P.39
P.40
P.39
P.40
P.42
P.42
P.43
P.42
P.40
P.39
P.40
P.40
P.41
*2
*2
*2
*2
*2
*2
*2
*2
*2