Alliance Laundry Systems BU170S Service Manual download pdf (Page 73)

70422201R1

On Premise Micro Control (RM) Troubleshooting

42.Unit Will Not Heat – Gas/Steam (continued)

Please see following page for wiring diagram information.

TMB2359S-b

Is there

voltage to the

output side of the

stove limit?

Is there

voltage to

terminal 2 of the

Ignition Control

Module (ICM)?

Yes

Check operation

of stove limit.

Replace if

necessary.

Correct wiring

between terminal 2

of ICM and stove

limit.

Is there

voltage at

terminal 1 of

ICM board?

Replace

ICM board.

Yes

(11)

(13)

Continued from

(12)

Note: Make sure unit is

not in a lockout condition.

Is there

voltage across

the coils of the

gas valve?

Correct wiring

between gas

valve and

ICM board.

(14)

Yes

Is there gas flow

through the gas

valve?

Replace gas

valve coils or

complete

gas valve.

Yes

Does the igniter

spark?

Replace high

voltage ignition

cable, igniter or

ICM board.

Is there a

flame?

Unit

operational.

Yes

Yes (Gas)

Yes (Steam)

Continued from

Is there

24 VAC across

the coil of the

steam valve?

Correct wiring

between steam

valve coil and

motor.

Does the

steam valve

coil have

continuity?

Replace the

steam valve

coil.

Yes

Connect the

steam supply.

Is the steam

supply

functional?

Yes

Replace or

rebuild the

steam valve.

Yes

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Alliance Laundry Systems BU170S Service Manual Page 73

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