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Section 3 Troubleshooting
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
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
28. CD MODELS: NO HEAT WITH VEND SATISFIED AND UNIT RUNNING
NOTE: All voltage checks are referenced to neutral unless stated otherwise.
Step Problem
If No, then
1
Is there voltage to the output of the motor switch?
If yes, continue to next step.
Replace motor.
2
Is there voltage to the input of the cabinet limit?
If yes, continue to next step.
Correct wiring between cabinet limit and motor switch.
3
Is there voltage to the output of the cabinet limit?
If yes, continue to next step.
Check for proper operation, replace if necessary.
4
Is there voltage to the COM terminal of the airflow switch?
If yes, continue to next step.
Correct wiring between airflow switch and cabinet limit.
5
Is there voltage to the N.O. terminal of the airflow switch?
If yes, continue to next step.
Check for proper airflow and function of the airflow
switch. Replace airflow switch if necessary.
6
Is there voltage to the input of the stove limit?
If yes, continue to next step.
Correct wiring between stove limit and airflow switch.
7
Is there voltage to the output of the stove limit?
If yes, continue to next step.
Check for blockage and proper airflow. Replace stove
limit if necessary.
8
Is there voltage to the COM terminal of switch B?
If yes, continue to next step.
Correct wiring between switch B and stove limit.
9
Is there voltage to the N.C. terminal of switch B?
If yes, continue to next step.
Check for proper operation, replace switch B if
necessary.
10
Is there voltage to temperature control board? If yes,
continue to next step.
Check for voltage at thermistor, or correct wiring
between thermostat and switch B.
11
Is there voltage to temperature control board? If yes,
continue to next step.
Disconnect thermistor wires and check resistance across
terminals. Should read approximately 50,000 Ohms at
77°F. Resistance should decrease with a temperature
increase. Replace board if necessary.
12
Is there voltage to the output? If yes, continue to next step. Correct wiring between IEI board and temperature
control board.
13
Does the igniter spark? If yes, continue to next step.
Check for proper igniter gaps and resistance for high
voltage lead.
14
Is there voltage across V1 and V3 of the IEI board?
If yes, continue to next step.
Replace IEI board.
15
Is there voltage across the coils of the gas valve?
If yes, continue to next step.
Correct wiring between gas valve and IEI board.
16
Is there a flame? If yes, unit is operational.
Continue to next step.
17
Is there gas pressure on the output side of the gas valve?
If yes, continue to next step.
Replace gas valve.
18
Check for proper gas pressure. 3.5 water column inches for
Natural Gas, 10.5 water column inches for L.P. Gas.
† Proper gaps for igniter: 5/16 above burner and 5/32 between electrode and grounding tab. The proper resistance of the high
voltage lead is between 5,000 Ohms and 25,000 Ohms.
