SUPER DIGITAL

[P12 error]
Turn off the power.
Is there no connection error or
disconnection on connectors CN333
and CN334 of indoor unit P.C. board
(MCC-1570)?
NO
YES
Correct connection
of connector.
CN333
Remove connectors CN333
and CN334 of indoor unit P.C. board
(MCC-1570).
CN334
Does the fan rotate without trouble
when handling the fan with hands?
YES
NO
Replace indoor fan motor.
Are resistance values
between phases at fan motor connector
CN333 motor side of indoor P.C. board
(MCC-1570) correct? ∗1
Incorrect
Replace indoor fan motor.
Correct
∗1
• Are not coil windings between
between ƒ (White lead) and … (Black lead),
(Red lead) and ƒ (White lead),
between … (Black lead) and (Red lead) opened or shorted?
→ The resistance should be the resistance value below.
SM40, SM45 → Approx. 70 to 100Ω
• Is not grounded between cabinet and , ƒ, …. → It should be 10MΩ or more.
Is resistance value of
fan motor connector CN334 motor side
of indoor P.C. board
(MCC-1570) correct? ∗2
Incorrect
Replace indoor fan motor.
Correct
∗2
Resistance value confirmation of the fan motor position detection circuit
Is not status between (Yellow lead) and ‚ (Pink lead) opened or shorted?
→ The resistance should be approx. 5k to 20kΩ.
Is output of
indoor fan motor position
detection signal correct? ∗3
NO
Replace indoor fan motor.
YES
∗3
Confirmation of the fan motor position detection signal
• Using a voltage tester, measure voltage between CN334 and ƒ on the indoor P.C. board
(MCC-1570) under condition that CN333 and CN334 are mounted and the power supply is turned on.
→ When rotating the fan slowly with hands, the pin voltage should shake between 0 and 5V.
• Between ‚ and ƒ: 5V
Check indoor P.C. board
(MCC-1570).
Defect → Replace
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