Oki 4M - Manual (Page 83)

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4 Heat assy error
• Turn the power supply off, then on again.
• Does the Halogen lamp of the heat assy go on?
• No Is the Halogen lamp or thermostat disconnected?
• Yes Replace the heat assy, Halogen lamp, or thermostat.
• No Replace the power supply unit.
• Yes Are the CN2 connectors of the power supply unit and main control board connected
correctly?
• No Connect the CN2 connectors correctly.
• Yes Replace the main control board.