Alliance Laundry Systems BU170S Service Manual download pdf (Page 21)

70422201R1

Troubleshooting

6. No Heat Condition

Is the Ignition Control

Module’s red light on?

Yes

Refer to

Paragraph 7.

Replace igniter and high

voltage lead. Retest unit. If

unit still does not spark,

replace module.

Refer to Paragraph 7

for heat circuit

troubleshooting.

Is there

24 volts AC between

the TH and GND terminals

on the module?

Yes

Check wiring between

gas valve and module.

If wiring is good,

replace module.

Yes

Is there continuity

between GND terminal on

module and machine?

No No

Does the igniter

spark but no

flame is produced?

Yes

Is there

24 volts AC at the gas

valve coils when igniter

is sparking?

Is the igniter

positioned properly

in the flame, and does the

flame look good?

Does the igniter

spark?

Verify that gas is supplied

to the machine. If gas and

voltage are present,

replace gas valve or coils.

Does the flame turn

off after igniter

stops sparking?

Yes

Replace module.

Adjust position of

igniter and retest.

Yes

Verify machine is

properly grounded.

Replace igniter and

high voltage lead.

Retest unit. If it still

does not sense flame,

replace module.

TMB2395S

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Alliance Laundry Systems BU170S Service Manual Page 21

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