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[P12 error]
Correct connection of connector.
Correct setting of the static pressure.
Replace indoor fan motor.
*
1
• Are not coil windings between
(Red lead) and (White lead),
between
(White lead) and (Black lead), between
(Black lead) and (Red lead) opened or shorted?
→ For resistance, see the winding Resistance of Fan Motor.
(Page 57)
*
2
Check resistance of fan motor position detection circuit.
Is not coil winding between (Yellow lead) and (Pink lead)
opened or shorted? → Resistance: Approx. 5 to 20kΩ
*
3
Check fan motor position detection signal.
• Using a tester, measure the voltage between CN334 and of
indoor P.C. board (MCC-1631) under condition that CN333 and
CN334 are mounted and the power is turned on.
→ Rotate the fan slowly with hands, and check the pin voltage
swings between 0 to 5V voltage.
• Between and : 5V
Check indoor P.C. board
(MCC-1631).
Defect → Replace
Remove connectors CN333 and
CN334 of indoor unit P.C. board
(MCC-1631).
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
YES
NO
NO
NO
NO
NO
NO
YES
YES
NO
YES
YES
YES
YES
Is resistance value of fan motor connector
CN333 at motor side of indoor P.C. board
(MCC-1631) correct? *2
Are not there connections errors or
disconnection on connectors CN333 and CN334
of indoor unit P.C. board (MCC-1631)?
Are resistance values between phases
at fan motor connector CN333 motor side of
indoor P.C. board (MCC-1631) correct? *1
Is signal output of indoor fan motor
position detection correct? *3
Does the fan rotate without trouble
when handling the fan with hands?
Change cappacity setting.
Turn off the power.
Is the static pressure setting correct?
Is the capacity setting correct?
1 3
3 5
5
1
1 5
4 5
4
1
CN333
CN334