45
Abnormality of pipe temperature
thermistor/condenser-evaporator/
or tank water temperature thermistor
U2
U1
U8
Ud
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P4
P5
P6
Indication
Error
Check
code
*1
Outdoor controller board
Contents
Inspection method
LED1 (Green) LED2 (Red)
3 blinking 1 blinking
2 blinking
3 blinking
*1 Check code displayed on remote controller
*2 Refer to the service manual of indoor unit, which will be issued on May 2015.
4 blinking
5 blinking
6 blinking
7 blinking
1 blinking
2 blinking
3 blinking
4 blinking
Abnormality of comp. surface
thermistor(TH32)
1
Check if stop valves are open.
2
Check if connectors (TH32 and LEV-A) on outdoor controller
board are not disconnected.
3
Check if unit is filled with specified amount of refrigerant.
4
Measure resistance values among terminals on indoor valve and
outdoor linear expansion valve using a tester.
Abnormal high pressure (High
pressure switch 63H operated.)
Abnormality of outdoor fan
motor rotational speed
1
Check if indoor/outdoor units have a short cycle on their air ducts.
2
Check if connector (63H) 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
using a tester.
1
Check if stop valves are open.
2
Check looseness, disconnection, and converse connection of
compressor wiring.
3
Measure resistance values among terminals on compressor using a tester.
4
Check if outdoor unit has a short cycle on its air duct.
Compressor overcurrent
breaking(Start-up locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
Open/short of comp. surface
thermistor (TH32)
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
1
Check if connectors(TH3, TH6,TH7 and TH32)on outdoor controller
board and connector (CN3) on outdoor power board are not disconnected.
2
Measure resistance value of outdoor thermistors.
Abnormality of heat sink
temperature
1
Check if indoor/outdoor units have a short cycle on their air ducts.
2
Measure resistance value of outdoor thermistor(TH8).
1
Check the outdoor fan motor.
2
Check if connector (TH3) on outdoor controller board is disconnected.
Abnormality of voltage
1
Check looseness, disconnection, and converse connection of
compressor wiring.
2
Measure resistance value among terminals on compressor using a tester.
3
Check if power supply voltage decreases.
4
Check the wiring of CN52C.
Abnormality of room temperature
thermistor (TH1)
Abnormality of pipe temperature
thermistor /Liquid (TH2)
1
Check if connectors or terminal blocks on indoor controller board are not
disconnected.
2
Measure resistance value of indoor thermistors.
Abnormality of drain sensor (DS)
Float switch(FS) connector open
Indoor drain overflow protection
1
Check if connectors or terminal blocks on indoor controller board is not
disconnected.
2
Measure resistance value of indoor thermistors.
3
Measure resistance value among terminals on drain pump using
a tester.
4
Check if drain pump works.
5
Check drain function.
Freezing (cooling)/overheating
(heating) protection
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.
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
Detailed
reference
page
Protection from overheat operation(TH3)
*2
OCH583
