Mitsubishi PK24FL3 - 3. WRONG WIRING ON SITE; 4. HOW TO CHECK THE PARTS

OC275-34
3. WRONG WIRING ON SITE
Symptom due to wrong wiring between indoor and outdoor units
4. HOW TO CHECK THE PARTS
Wrong wiring Thermostat Phenomena
Outdoor unitIndoor unit
1
2
1
2
OFF The outdoor unit stops.
ON
Operation stops. 9 minutes later, the check code ¨P8¨ appears
on the remote controller display.
OFF Operation stops.
ON
9 minutes later, the check code ¨P8¨ appears on the remote con-
troller display.
Disconnect between 1 and 1 or 2 and
2.
Room temperature
thermistor (RT1)
Pipe temperature
thermistor (RT2)
Fan motor (MF)
Disconnect the connector, then measure the resistance using a tester.
(Surrounding temperature 50°F to 86°F)
Measure the resistance between the terminals using a tester.
Opening and closing temperature of protector.
Open: 266i41°F (Fan motor OFF)
Close: 176i68°F (Fan motor ON)
Normal
4.3k' to 9.6k'
Abnormal
Open or short
Motor terminal
or
Relay connector
Normal
PK
18,24FL3
Abnormal
Red-White
99.5'i10%
Open or short
White-Black
103.5'i10%
1
1
3
3
5
5
Red
White
Black
Relay connector
Protector
Parts name Check points
30,36FL3
62.6'i10%
74.0'i10%
Vane motor (MV)
Measure the resistance between the terminals using a tester.
(Surrounding temperature 68°F to 86°F)
Normal
186 to 214'
Abnormal
Open or short
3 6 1
4
5
2
M
Pink
Connector
Red
Orange
Blue
Brown
Yellow
Brown-Yellow
Brown-Blue
Red-Orange
Red-Pink
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