Mitsubishi Electric PUHZ-SW160YKA-BS Service Manual page 45

Indication
Outdoor controller board
LED1 (Green) LED2 (Red)
3 blinking 1 blinking
Abnormality of comp. surface
thermistor(TH32)
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
Open/short of comp. surface
5 blinking
thermistor (TH32)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
6 blinking Abnormality of heat sink
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/
or tank water temperature thermistor
2 blinking Abnormality of drain sensor (DS)
Float switch(FS) connector open
Indoor drain overflow protection
3 blinking
Freezing (cooling)/overheating
(heating) protection
*1 Check code displayed on remote controller
*2 Refer to the service manual of indoor unit.
OCH583A
Check
Contents
code
*1
1Check if stop valves are open.
U2
2Check if connectors (TH32 and LEV-A) 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.
U1
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.
U8
1Check the outdoor fan motor.
2Check if connector (TH3) on outdoor controller board is disconnected.
Ud
1Check if stop valves are open.
UF
2Check looseness, disconnection, and converse connection of
compressor wiring.
3Measure resistance values among terminals on compressor using a tester.
UP
4Check if outdoor unit has a short cycle on its air duct.
UH
5Check leakage of refrigerant.
U6
U3 1Check if connectors(TH3, TH6,TH7 and TH32)on outdoor controller
board and connector (CN3) on outdoor power board are not disconnected.
2Measure resistance value of outdoor thermistors.
U4
1Check if indoor/outdoor units have a short cycle on their air ducts.
U5
2Measure resistance value of outdoor thermistor(TH8).
U9
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 or terminal blocks on indoor controller board are not
P1
disconnected.
2Measure resistance value of indoor thermistors.
P2
P9
1Check if connectors or terminal blocks on indoor controller board is not
P4
disconnected.
2Measure resistance value of indoor thermistors.
3Measure resistance value among terminals on drain pump using
P5 a tester.
4Check if drain pump works.
5Check drain function.
1Check if indoor unit has a short cycle on its air duct.
2Check if heat exchanger and filter is not dirty.
P6
3Measure resistance value on indoor and outdoor fan motors.
4Check if the inside of refrigerant piping is not clogged.
Error
Inspection method
45
Detailed
reference
page
P.20
-
P.20
P.21
P.23
P.23
P.24
P.23
P.21
P.20
P.21
P.21
P.22
*2
*2
*2
*2
*2