Service manual

46 70304901

Micro Display Control (MDC) Troubleshooting

24.Error Codes

OP - Indicates physical “open” in the thermistor

circuit. Possible causes are: 1) thermistor, 2)

wiring between control and thermistor, 3) control.

SH - Indicates a “short” in the thermistor circuit.

Possible causes are: 1) shorted thermistor, 2) a

short in the wiring between control and

thermistor, 3) control.

Card Reader Machines: (In addition to the

above errors)

EC:19 - Indicates no card reader communication.

The control and the reader cannot communicate.

Check reader, control and harness.

NOTE: For all other card reader errors, consult

the card reader manual provided by the

manufacturer.

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

• Whenever ground wires are removed during servicing, these ground wires must be

reconnected to ensure that the tumbler is properly grounded.

W002

WARNING

Display Definition Corrective Action

Indicates an open circuit in the thermistor. • Check thermistor. Replace if inoperative.

• Check wiring between control and

thermistor. Refer to wiring diagram for

proper wiring.

• Check control. Replace if inoperative.

Indicates a short circuit in the thermistor. • Check thermistor. Replace if inoperative.

• Check wiring between control and

thermistor. Refer to wiring diagram for

proper wiring.

• Check control. Replace if inoperative.

EC:19

*Card Reader

models only

Indicates no communication between

control and card reader.

• Check card reader. Replace if inoperative.

• Check wire harness connecting card reader

and control. Replace if inoperative.

• Check control. Replace if inoperative.