Service manual

SiE18-201 Troubleshooting - Outdoor Unit Related

Service Diagnosis 247

3.3.33 Faulty BOX Thermistor Malfunction

Outdoor Unit

Indication

Method of

Malfunction

Detection

Malfunction of BOX temperature thermistor is detected using the temperature detected by the

thermistor.

Malfunction

Decision

Conditions

When the detected temperature came to 92˚C or higher, or to -30˚C or lower

 When BOX thermistor malfunction is detected once, the system shuts down.

(The 1-time counter automatically resets itself when cause of malfunction is resolved.)

Supposed

Causes

 Faulty main unit PC board

Troubleshooting

Start

Replace main unit PC

board.

Reset normally.

Could be outside causes

other than parts defect.

(MF053)

Caution

Be sure to turn off power switch before connect or disconnect connector,

or parts damage may be occurred.

Turn the power supply off

once and then back on.

Is P3 displayed again?

YES

P3 displayed