Mitsubishi Electric PUZ-HA30NHA5 Service Manual page 63

Indication
Outdoor controller board
LED1 (Green) LED2 (Red)
3 blinking 1 blinking
Abnormality of shell thermostat
and discharging temperature (TH4)
Abnormality of superheat due
to low discharge temperature
Abnormal high pressure (High
2 blinking
pressure switch 63H worked.)
Abnormal low pressure (Low
pressure switch 63L worked.)
3 blinking
Abnormality of outdoor fan
motor rotational speed
Protection from overheat operation(TH3)
Compressor overcurrent
4 blinking
breaking(Start-up locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
Open/short of discharge thermistor (TH4)
5 blinking
Open/short of outdoor thermistors
(TH3, TH32, TH33, 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 connector open (FS)
Indoor drain overflow protection
3 blinking
Freezing (cooling)/overheating
(heating) protection
4 blinking Abnormality of pipe
temperature
*1 Check code displayed on remote controller
*2 Refer to service manual for indoor unit.
OCH607
Check
Contents
code
*1
1 Check if stop valves are open.
U2
2 Check if connectors (TH4, LEV-A, and LEV-B) on outdoor controller
3 Check if unit is filled with specified amount of refrigerant.
U7
4 Measure resistance values among terminals on indoor valve and
1 Check if indoor/outdoor units have a short cycle on their air ducts.
U1
2 Check if connector(63H)(63L) on outdoor controller board is not disconnected.
3 Check if heat exchanger and filter is not dirty.
4 Measure resistance values among terminals on linear expansion valve
UL
U8
1 Check the outdoor fan motor.
2 Check if connector (TH3) on outdoor controller board is disconnected.
Ud
UF 1 Check if stop valves are open.
2 Check looseness, disconnection, and converse connection of
3 Measure resistance values among terminals on compressor using a tester.
UP
4 Check if outdoor unit has a short cycle on its air duct.
UH
U6
U3 1 Check if connectors(TH3,TH32,TH33,TH4, and TH7/6)on outdoor
U4
2 Measure resistance value of outdoor thermistors.
1 Check if indoor/outdoor units have a short cycle on their air ducts.
U5
2 Measure resistance value of outdoor thermistor(TH8).
U9
1 Check looseness, disconnection, and converse connection of
2 Measure resistance value among terminals on compressor using a tester.
3 Check if power supply voltage decreases.
4 Check the wiring of CN52C.
5 Check the wiring of CNAF.
P1 1 Check if connectors (CN20, CN21, CN29 and CN44) on indoor
P2
2 Measure resistance value of indoor thermistors.
P9
P4
1 Check if connector (CN31)(CN4F) on indoor controller board is not
2 Measure resistance value of indoor thermistors.
3 Measure resistance value among terminals on drain-up machine using
P5
4 Check if drain-up machine works.
5 Check drain function.
P6
1 Check if indoor unit has a short cycle on its air duct.
2 Check if heat exchanger and filter is not dirty.
3 Measure resistance value on indoor and outdoor fan motors.
4 Check if the inside of refrigerant piping is not clogged.
P8 1 Check if indoor thermistors (TH2 and TH5) are not disconnected from holder.
2 Check if stop valve is open.
3 Check converse connection of extension pipe. (on plural units connection)
4 Check if indoor/outdoor connecting wire is connected correctly.
Error
Inspection method
board are not disconnected.
outdoor linear expansion valve using a tester.
using a tester.
compressor wiring.
controller board and connector (CN3) on outdoor power board are not
disconnected.
compressor wiring.
controller board are not disconnected.
disconnected.
a tester.
(on plural units connection)
63
Detailed
reference
page
P.28
P.29
P.28
P.31
P.30
P.31
P.31
P.31
P.31
P.29
P.28
P.29
P.29
P.30
*2
*2
*2
*2
*2
*2