Mitsubishi Electric Mr.Slim PLH42AK, Technical & Service Manual

Page: 49 / 73

OC193-47
3. WRONG WIRING ON SITE
3-1 Between remote controller and indoor unit
If the wire is disconnected between the remote controller and the indoor unit, nothing is displayed on the remote controller
when the POWER button is pressed. The beep sound will also not be heard.
3-2 Phenomenon due to wrong wiring between indoor and outdoor units
Wrong wiring Mode Thermostat Phenomenon
Outdoor Indoor
1
2
3
1
2
3
COOL
OFF Operation stops.
ON
4-Way valve turns ON. 9 minutes later, check code “P8” appears
on remote controller display.
HEAT
OFF
Cooling operation. Several minutes later, check code “P8” appears
on remote controller display.
ON Normal operation.
Outdoor Indoor
1
2
3
1
2
3
COOL
OFF Outdoor unit stops.
ON
Operation stops. 9 minutes later, check code “P8” appears on
remote controller display.
HEAT
OFF Operation stops.
ON
Operation stops. 27 minutes later, check code “P8” appears on
remote controller display.
Outdoor Indoor
1
2
3
1
2
3
COOL
OFF Outdoor unit stops.
ON
Operation stops. 9 minutes later, check code “P8” appears on
remote controller display.
HEAT
OFF Operation stops.
ON
Operation stops. 27 minutes later, check code “P8” appears on
remote controller display.
Outdoor Indoor
1
2
3
1
2
3
COOL
OFF Outdoor unit stops.
ON
Operation stops. 9 minutes later, check code “P8” appears on
remote controller display.
HEAT
OFF Operation stops.
ON
Operation stops, 27 minutes later, check code “P8” appears on
remote controller display.
Outdoor Indoor
1
2
3
1
2
3
COOL
OFF Outdoor unit stops.
ON
Operation stops. 9 minutes later, check code “P8” appears on
remote controller display.
HEAT
OFF Operation stops.
ON
Operation stops. 27 minutes later, check code “P8” appears on
remote controller display.
Disconnection between 1 and 1 or 2
and 2.
COOL
OFF Operation stops.
ON
Operation stops. 9 minutes later, check code “P8” appears on
remote controller display.
HEAT
OFF Operation stops. 4-way valve turns OFF.
ON
27 minutes later, check code “P8” appears on remote controller
display.
Disconnection between 3 and 3.
COOL
–
Normal operation.
HEAT
OFF Operation stops. 4-way valve turns OFF.
ON
Operation stops. 27 minutes later, check code “P8” appears on
remote controller display.