Alliance Laundry Systems BU170S Service Manual download pdf (Page 67)

70422201R1

65

On Premise Micro Control (RM) Troubleshooting

40.Door Open Indicator

Is there

24 VAC at the

input of the

secondary

fuse?

Door Open

Indicator

Is there

24 VAC between

H2-8 and

H2-9?

Is there

power supplied

to the unit?

No

Replace control.

Yes

Plug unit in and

start cycle.

No

Is there

120 VAC at

output side of the

primary fuses?

No

Replace primary

fuse(s).

Is there

120 VAC across

terminals 1 & 2 of

transformer

primary?

No

Correct wiring

between primary

fuses and

transformer.

TMB2321S-a

Yes

No

Replace

transformer.

Is there

24 VAC across

terminals 2 &

3 of transformer

secondary?

Yes

Is there

120 VAC at input

of primary fuses?

No

Correct wiring

between primary

fuses and power

supply.

Yes

Gas and steam heat.

Three phase power supply.

(1)

(2)

(3)

(4)

(5)

Yes

Reference voltage

checks to transformer

neutral.

(6)

Correct wiring

between

secondary

fuse and

transformer.

Yes

No

Is there

24 VAC at output

side of secondary

fuse?

(7)

No

Replace

secondary fuse.

Is there

24 VAC at COM

of door switch?

(8)

No

Correct wiring

between COM

and output of

secondary fuse.

Yes

Yes

Continued on

next page

Yes

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