Alliance Laundry Systems BU170S Service Manual download pdf (Page 87)

70422201R1

LED OPL and UniLinc Troubleshooting

48.Airflow Errors

UniLinc Error Display: Airflow Switch Sensed Closed While Not In Run Mode

Airflow Switch Does Not Close After Cycle Started

Airflow Switch Bounces During A Running Cycle

LED OPL Error Display: E AF1

E AF2

E AF

Is there 24 volts AC

at H6-1 to H6-9?

Is there 24 volts AC

at H2-12 to H6-9?

Check Transformer

and Fuse F3.

Replace

I/O Board (AP1).

Yes

Check control harness

H3 and I/O Board (AP1).

Replace as required.

Is there 5 volts DC at H3-7

to H3-11 with switch open

and 0 volts DC with

switch closed?

(1)

(2)

(3)

(4)

CAUTION: Always power down the machine

PRIOR to disconnecting or connecting the

H3 harness. Once disconnected, you can

power up the machine for troubleshooting.

Failure to do so may damage the front-end control.

NOTE: The following checks are DC

voltage checks.

Replace front-end

control (AP2).

NOTE: Check airflow switch for proper mechanical operation; ensure there is no lint or other items interfering

with the proper operation.

NOTE: The airflow switch is required to be open prior to the beginning of the cycle. The switch is also required

to close within the cycle.

NOTE: If the voltage is present but

lower than 24 volts AC, ensure the

correct transformer configuration

jumper is installed.

Check harness and

airflow switch.

Repair or replace

as required.

Is there 24 volts AC at

H2-5 to H6-9 with airflow

switch closed?

TMB2378S

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Alliance Laundry Systems BU170S Service Manual Page 87

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