Mitsubishi Electric PUHZ-HRP200YKA Service Manual page 38

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 operated.)
Abnormal low pressure (Low
pressure switch 63L operated.)
3 blinking Abnormality of outdoor fan
motor rotational speed
Protection from overheat operation
(TH3), (T
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)
Open/short of outdoor thermistors
(TH3, TH32, TH6, TH7 and TH8)
Abnormality of heatsink
6 blinking
temperature
7 blinking
Abnormality of voltage
4 blinking 1 blinking
Abnormality of water temperature thermistor (TH1)
Abnormality of pipe temperature thermistor / Liquid (TH2)
Abnormality of actual tank temperature thermistor
(TH5)
3 blinking
Freezing (cooling)/overheating
(heating, heating ECO,
anti freeze, hot water) protection
1 Error code displayed on remote controller
2 Refer to Technical manual of ATW, I/F and FTC.
Error
Contents
code
U2
U7
U1
UL
U8
Ud
)
63HS
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P6
Error
Inspection method
1
Check if stop valves are open.
Check if connectors (TH4, 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.
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 the outdoor fan motor.
Check if connector (TH3) (63HS) on outdoor controller board is disconnected.
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.
Check if connectors(TH3,TH32,TH4, and TH7/6)on outdoor
controller board and connector (CN3) on outdoor power board are not
disconnected.
Measure resistance value of outdoor thermistors.
Check if outdoor unit have a short cycle on their air ducts.
Measure resistance value of outdoor thermistor (TH8).
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.
Check if terminal on I/F or FTC are not disconnected.
Measure resistance value of I/F or FTC thermistors.
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.
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