38
U2
U7
U1
UL
U8
Ud
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P6
Indication
Error
Error
code
+
1
Outdoor controller board
Contents
Inspection method
LED1 (Green) LED2 (Red)
3 blinking 1 blinking
2 blinking
3 blinking
1 Error code displayed on remote controller
2 Refer to Technical manual of ATW, I/F and FTC.
4 blinking
5 blinking
6 blinking
7 blinking
1 blinking
3 blinking
4 blinking
Abnormality of comp. surface
temperature (TH34) and discharging
temperature (TH4)
Abnormality of superheat due
to low discharge temperature
Check if stop valves are open.
Check if connectors (TH4, TH34, LEV-A, and LEV-B) on outdoor
controller board are not disconnected.
Check if unit is filled with specified amount of refrigerant.
Measure resistance values among terminals on indoor valve and
outdoor linear expansion valve using a tester.
Abnormal high pressure (High
pressure switch 63H operated.)
Abnormal low pressure (Low
pressure switch 63L operated.)
Abnormality of outdoor fan
motor rotational speed
Check if outdoor unit have a short cycle on their air ducts.
Check if connector(63H)(63L) on outdoor controller board is not disconnected.
Check if heat exchanger and filter is not dirty.
Measure resistance values among terminals on linear expansion valve
using a tester.
Check if stop valves are open.
Check looseness, disconnection, and converse connection of
compressor wiring.
Measure resistance values among terminals on compressor using a tester.
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 outdoor thermistors
(TH4, TH34)
Open/short of outdoor thermistors
(TH3, TH32, TH6, TH7 and TH8)
Check if connectors(TH3,TH32,TH4, TH34 and TH7/6)on outdoor
controller board and connector (CN3) on outdoor power board are not
disconnected.
Measure resistance value of outdoor thermistors.
Abnormality of heatsink
temperature
Check if outdoor unit have a short cycle on their air ducts.
Measure resistance value of outdoor thermistor (TH8).
Check the outdoor fan motor.
Check if connector (TH3) (63HS) on outdoor controller board is disconnected.
Abnormality of voltage
Check looseness, disconnection, and converse connection of
compressor wiring.
Measure resistance value among terminals on compressor using a tester.
Check if power supply voltage decreases.
Abnormality of water temperature thermistor (TH1)
Abnormality of pipe temperature thermistor / Liquid (TH2)
Abnormality of actual tank temperature thermistor
(TH5)
Check if terminal on I/F or FTC are not disconnected.
Measure resistance value of I/F or FTC thermistors.
Freezing (cooling)/overheating
(heating, heating ECO,
anti freeze, hot water) protection
Check if short cycle of air path.
Check if heat exchanger and filter is not dirty.
Measure resistance value on outdoor fan motor.
Check if the inside of refrigerant piping is not clogged.
Protection from overheat operation
(TH3), (T
63HS
)
OCH534
