Mitsubishi PK18FL3 User Manual page 34

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