Wrong Wiring On Site; Between Remote Controller And Indoor Unit; Phenomenon Due To Wrong Wiring Between Indoor And Outdoor Units - Mitsubishi Electric Mr.Slim PKH18FL Technical & Service Manual

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
Indoor
1
2
3
Indoor
1
2
3
Indoor
1
2
3
Indoor
1
2
3
Indoor
1
2
3
Disconnection between 1 and 1 or 2
and 2.
Disconnection between 3 and 3.
Mode Thermostat
OFF
COOL
Outdoor
ON
1
2
OFF
3
HEAT
ON
OFF
COOL
Outdoor
ON
1
2
OFF
3
HEAT
ON
OFF
COOL
Outdoor
ON
1
2
OFF
3
HEAT
ON
OFF
COOL
Outdoor
ON
1
2
OFF
3
HEAT
ON
OFF
COOL
Outdoor
ON
1
2
OFF
3
HEAT
ON
OFF
COOL
ON
OFF
HEAT
ON
–
COOL
OFF
HEAT
ON
Operation stops.
4-Way valve turns ON. 9 minutes later, check code "P8" appears
on remote controller display.
Cooling operation. Several minutes later, check code "P8" appears
on remote controller display.
Normal operation until first thermostat OFF.
Outdoor unit stops.
Operation stops. 9 minutes later, check code "P8" appears on
remote controller display.
Operation stops.
Operation stops. 27 minutes later, check code "P8" appears on
remote controller display.
Outdoor unit stops.
Operation stops. 9 minutes later, check code "P8" appears on
remote controller display.
Operation stops.
Operation stops. 27 minutes later, check code "P8" appears on
remote controller display.
Outdoor unit stops.
Operation stops. 9 minutes later, check code "P8" appears on
remote controller display.
Operation stops.
Operation stops, 27 minutes later, check code "P8" appears on
remote controller display.
Outdoor unit stops.
Operation stops. 9 minutes later, check code "P8" appears on
remote controller display.
Operation stops.
Operation stops. 27 minutes later, check code "P8" appears on
remote controller display.
Operation stops.
Operation stops. 9 minutes later, check code "P8" appears on
remote controller display.
Operation stops. 4-way valve turns OFF.
27 minutes later, check code "P8" appears on remote controller
display.
Normal operation.
Operation stops. 4-way valve turns OFF.
Operation stops. 27 minutes later, check code "P8" appears on
remote controller display.
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Phenomenon