Alliance Laundry Systems BU170S Service Manual download pdf (Page 83)

70422201R1

LED OPL and UniLinc Troubleshooting

46.Stove and Cabinet Limit Errors

UniLinc Error Display: Stove and Cabinet Limit Errors

LED OPL Error Display: E Cab

E SL

E SL2

NOTE: The machine must currently be trying to heat with airflow switch closed, fan motor contactor

engaged and fan motor centrifugal switch closed before checking the status of the cabinet, stove and stove 2

limits.

Is there 24 volts AC at

H6-1 to H6-9?

Is there 24 volts AC st

H2-9 to H6-9?

Check Transformer

and Fuse F3.

Replace

I/O Board (AP1).

Replace

I/O Board (AP1).

Replace

I/O Board (AP1).

Check harness and

cabinet limit switch.

Repair or replace

as required.

Yes

TMB2376S

NOTE: Not all machines have the stove limit or the secondary stove limit switch. Please refer to your machine’s

wiring diagram. Also, some machines have manual reset thermostats; these must be reset prior to attempting the

troubleshooting procedures.

Is there 24 volts AC at

H2-2 to H6-9?

Is there 24 volts AC at

H2-7 to H6-9?

Check harness and

stove limit switch.

Repair or replace

as required.

Is there 24 volts AC at

H2-8 to H6-9?

Is there 24 volts AC at

H2-1 to H6-9?

Yes

Check harness and

secondary stove

limit switch. Repair

or replace as required.

Yes

Check control harness

H3. Replace harness

or I/O Board (AP1)

as required.

Check control harness

H3. Replace harness

or I/O Board (AP1)

as required.

Check control harness

H3. Replace harness

or I/O Board (AP1)

as required.

Yes

Is there 24 volts AC at

H2-11 to H6-9?

(1)

(2)

(3)

(5)

(6)

(7)

Is there 5 volts DC at

H3-9 to H3-11 with cabinet

limit circuit open and 0 volts

DC with switch closed?

Is there 5 volts DC

at H3-20 to H3-11 with stove

limit circuit open and 0 volts

DC with switch closed?

(8)

(4)

NOTE: Steam model machines will

utilize a jumper from pins H2-8 to H2-1.

NOTE: You will need to manually open

the circuit.

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.

NOTE: You will need to manually open

the circuit.

(9)

Is there 5 volts DC at

H3-10 to H3-11 with

secondary stove limit circuit

open and 0 volts DC with

switch closed?

Yes

Replace front-end

control (AP2).

(10)

NOTE: The machine must currently be trying to heat with airflow switch closed, fan motor contactor engaged

and fan motor centrifigal switch closed before checking the status of the cabinet, cabinet store and store 2 limits.

NOTE: If the voltage is present but

lower than 24 volts AC, ensure the

correct transformer configuration

jumper is installed.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 119 120

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Alliance Laundry Systems BU170S Service Manual Page 83

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