Mitsubishi Electric PUHZ-FRP71VHA2R1, Руководство по обслуживанию

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58
OCH665B
Indication Error
Outdoor controller board
Contents
Check
code
*1
Inspection method
Detailed
reference page
LED1 (Green) LED2 (Red)
3 blinking 1 blinking Abnormality of comp. surface
thermistor (TH33) and discharging
temperature (TH4)
U2
1
Check if stop valves are open.
2
Check if connectors (TH4, TH33, LEV-A, and LEV-B) 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.
P.28
2 blinking Abnormal high pressure (High
pressure switch 63H operated.)
U1
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.
P.28
3 blinking Abnormality of outdoor fan motor
rotational speed
U8
1 Check the outdoor fan motor.
2 Check if connector (TH3) on outdoor controller board
is disconnected.
P.29
Protection from overheat
operation(TH3)
Ud P.31
4 blinking Compressor overcurrent breaking
(Startup locked)
UF
1
Check if stop valves are open.
2
Check looseness, disconnection, and reverse 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.
P.31
Compressor overcurrent breaking UP P.31
Abnormality of current sensor (P.B.) UH P.31
Abnormality of power module U6 P.28
5 blinking Open/short of discharge thermistor (TH4) and
comp. surface thermistor (TH33)
U3
1 Check if connectors(TH3,TH4,TH6 ,TH7 and TH33)
on outdoor controller board and connector (CN6) on
outdoor power board are not disconnected.
2 Measure resistance value of outdoor thermistors.
P.28
Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8)
U4 P.29
6 blinking Abnormality of heatsink
temperature
U5
1
Check if indoor/outdoor units have a short cycle on
their air ducts.
2
Measure resistance value of outdoor
thermistor(TH8).
P.29
7 blinking Abnormality of voltage
U9
1
Check looseness, disconnection, and reverse
connection of compressor wiring.
2
Measure resistance value among terminals on
compressor using a tester.
3
Check if power supply voltage decreases.
P.30
4 blinking 1 blinking Abnormality of room temperature thermistor (TH1) P1 1 Check if connectors (CN20, CN21, CN29 and CN44)
on indoor controller board are not disconnected.
2 Measure resistance value of indoor thermistors.
*2
Abnormality of pipe temperature
thermistor /Liquid (TH2)
P2
*2
Abnormality of pipe temperature
thermistor/Condenser-Evaporator
P9
*2
2 blinking Abnormality of drain sensor (DS)
Float switch(FS) connector open
P4
1 Check if connector (CN31)(CN4F) 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.
*2
Indoor drain overflow protection
P5
Leakage error (refrigerant system)
PA
1 Reverse connection of piping or wiring
Note: The error will be cancelled by turning off
power, and on again.
2 Check if there are any inclination or clogging in drain pipe.
3 Check if drain pan or drain sensor is dirty.
4 Check if any foreign matter is attached to the moving
part of float switch.
5 Check LEV for proper function.
*2
3 blinking Freezing (cooling)/overheating
(heating) protection
P6
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.
*2
4 blinking Abnormality of pipe
temperature
P8
1 Check if indoor thermistors(TH2 and TH5) are not
disconnected from holder.
2 Check if stop valve is open.
3 Check reverse connection of extension pipe. (on
plural units connection)
4 Check if indoor/outdoor connecting wire is connected
correctly. (on plural units connection)
*2
5 blinking Indoor unit fan motor error PB(Pb) Defective fan motor winding
*2
*1
Check code displayed on remote controller
*2
Refer to the indoor unit’s service manual.