Alliance Laundry Systems BU170S Service Manual download pdf (Page 20)

70422201R1

Troubleshooting

5. No Heat Condition (Non-CE and Non-Australian Models)

Ignition Control Module Function

There are four components to the ignition system: the

module, the spark igniter, the high voltage cable and

ground wire. When 24 VAC is applied between the TH

and GND terminals on the module, the module will

send the high voltage signal to the igniter and 24 VAC

to the gas valve coils. Gas will hit the sparking igniter

and flame will be established. The igniter being

engulfed in flame will create a millivolt electric signal

that is sent back to the module by the high voltage

cable; this is what the module sees as flame

recognition. If the millivolt signal is not at the module

in ten seconds, the module will go into safety lockout.

The voltage will be cut from the igniter and gas valve

coils and will not be restored until voltage is cycled at

the module.

Intermittent Heat Test Procedure

On ignition control modules with date codes higher

than 08t2, perform the following test.

Start the tumble dryer and run for 10 minutes (verify

that the tumble dryer is heating properly). After the 10

minute cycle, re-start the tumble dryer and once again

verify the unit is heating. Repeat this procedure 3

times. If the tumble dryer passes this test, the ignition

control module is operating properly and SHOULD

NOT be changed. Refer to Troubleshooting Manual

for additional service procedures.

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

• Disconnect electric power to the tumble dryer before servicing.

• Close gas shut-off valve to gas tumble dryer before servicing.

• Close steam valve to steam tumble dryer before servicing.

• Never start the tumble dryer with any guards/panels removed.

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

reconnected to ensure that the tumble dryer is properly grounded.

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WARNING

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Alliance Laundry Systems BU170S Service Manual Page 20