Mitsubishi Electric PCH-2.5GKHA, Руководство по обслуживанию

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51
Check
code
Diagnosis of malfunction Cause Check points
EO Signal transmitting/receiving
error
(Indoor controller does not
respond to remote controller
signal.) During individual unit control
1) Bad contact of transmission
wire
2) Signal transmitting/receiving
circuit is abnormal.
1) Check the transmission wire.
2) Check with another remote controller. If “EO” is
still indicated, replace the indoor controller
board.
If other check code appears. replace the
original remote controller.
P3 Signal transmission error
(Remote controller does not
respond to indoor controller
signal.) 1) Bad contact of transmission
wire
2) Signal transmitting/receiving
circuit is abnormal.
3) Wrong operation due to noise
wave emitted by other
appliances
1) Check the transmission wire.
2) Check with another remote controller.
If “P3” is still indicated, replace the indoor
board.
If other check code appears, replace the
original remote controller.
3) Short-circuit between
1
and
2
of CN40 and
attach CN40 to the following units.
●
Second unit in twin control
●
Second and third units in triple control
●
Sub units in group control
P4 Abnormality of drain sensor 1) Bad contact of transmission
wire
2) Damaged thermistor
1) Check the connector.
2) Measure the resistance of the thermistor
4
~
5
.
As for the normal resistance, refer to the case
of P1.
If the resistance is normal, replace the indoor
controller board.
P5 Malfunction of drain pump 1) Malfunction of drain pump
2) Damaged drain sensor 1) Check the drain pump.
2)
●
Check the drain sensor.
●
Check the drain sensor heater. Normal
resistance should be 82
Ω
.
If the resistance is normal, replace the indoor
controller board.
P6 Coil frost protection is
working. 1) Short cycle of air cycle
2) Dirty air filter
3) Damaged fan
4) Abnormal refrigerant 1) Clear obstructions from the air cycle.
2) Clean the air filter
3) Check the fan.
4) Check the refrigerant temperature.
P7 System error 1) Wrong address-setting
2) Signal transmitting/receiving
circuit of remote controller is
abnormal.
3) Wrong SW6-setting
1) Check the address-setting.
2) Check with another remote controller. If check
code other than “P7” appears, replace the
original remote controller.
3) Check SW6 setting.
P8 Abnormality in outdoor unit 1) Wrong wiring of indoor/outdoor
connecting wire
2) Reversed phase
3) Protection device is working
4) Damaged outdoor coil
thermistor
1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
4) Measure the resistance of the outdoor coil
thermistor. If the resistance is normal, replace
the outdoor controller board.
P1
P2
Abnormality of room
temperature thermistor (RT1)
Abnormality of indoor coil
thermistor (RT2)
1) Bad contact of thermistor
2) Damaged thermistor 1) Check the thermistor.
2) Measure the resistance of the thermistor.
Normal resistance should be as follows.
0 C ···15k
Ω
30 C·····4.3k
Ω
10 C······9.6k
Ω
40 C ·····3.0k
Ω
20 C······6.3k
Ω
If the resistance is normal, replace the indoor
controller board.