Mitsubishi Electric Mr. Slim PUZ-M200YKA2.UK Service Manual page 65

Indication
Outdoor controller board
LED1 LED2
(Green) (Red)
3 blinking 1 blinking Abnormality of discharge thermistor/comp.
surface thermistor (TH4/TH33)
Abnormality of superheat due to low
discharge temperature
2 blinking Abnormal high pressure(63H operated)/High
compressor temperature (TRS operated)
3 blinking Abnormality of outdoor fan motor rotational
speed
Protection from overheat operation(TH3)
4 blinking Compressor overcurrent breaking(Startup
locked)
Compressor overcurrent breaking
Abnormality of current sensor (P.B.)
Abnormality of power module
5 blinking Open/short of discharge thermistor (TH4)
and comp. surface thermistor (TH33)
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
2 blinking Abnormality of drain sensor (DS)
Float switch(FS) connector open
Indoor drain overflow protection
Leakage error (refrigerant system)
3 blinking Freezing (cooling)/overheating
(heating) protection
4 blinking Abnormality of pipe temperature
5 blinking Indoor unit fan motor error
*1 Check code displayed on remote controller
*2 Refer to the indoor unit's service manual.
OCH775B
Check
Contents code
*1
U2
U7
U1
U8
Ud
UF
UP
UH
U6
U3
U4
U5
U9
P1
P2
P9
P4
P5
PA
P6
P8
PB(Pb) Defective fan motor winding
65
Error
Inspection method
Check if stop valves are open.
Check if connectors (TH4,TH33, LEV-A, 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 indoor/outdoor units have a short cycle on
their air ducts.
Check if connector (63H and TRS) 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 if unit is filled with specified amount of
refrigerant.
Check the outdoor fan motor.
Check if connector (TH3) 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,TH4,TH6,TH7 and TH33)
on outdoor controller board and connector (CN3)
on outdoor power board are not disconnected.
Measure resistance value of outdoor thermistors.
Check if indoor/outdoor units 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 the wiring of CN52C.
Check if connectors (CN20, CN21, CN29
and CN44) on indoor controller board are not
disconnected.
Measure resistance value of indoor thermistors.
Check if connector (CN31)(CN4F) on indoor
controller board is not disconnected.
Measure resistance value of indoor thermistors.
Measure resistance value among terminals on
drain pump using a tester.
Check if drain pump works.
Check drain function.
Converse connection of piping or wiring
Note: The error will be cancelled by turning off
power, and on again.
Check if there are any inclination or clogging in
drain pipe.
Check if drain pan or drain sensor is dirty.
Check if any foreign matter is attached to the
moving part of float switch.
Check LEV for proper function.
Check if indoor unit has a short cycle on its air duct.
Check if heat exchanger and filter is not dirty.
Measure resistance value on indoor and outdoor
fan motors.
Check if the inside of refrigerant piping is not
clogged.
Check if indoor thermistors(TH2 and TH5) are not
disconnected from holder.
Check if stop valve is open.
Check converse connection of extension pipe.
(on plural units connection)
Check if indoor/outdoor connecting wire is
connected correctly.
(on plural units connection)
Detailed
reference
page
P.31
P.32
P.31
P.32
P.34
P.34
P.34
P.34
P.32
P.31
P.32
P.32
P.33
*2
*2
*2
*2
*2
*2
*2
*2