Alliance Laundry Systems BU170S Service Manual Page 41

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  • TROUBLESHOOTING
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70422201R1
39
Fire Supression System Troubleshooting
22.Tumble Dryer Does Not Operate and Light Is On
Are there signs of
fire or water
discharge?
Was there a fire?
Replace tumble dryer.
Call the fire department.
DO NOT disconnect electric power to the tumble dryer.
DO NOT disconnect water to the tumble dryer.
DO NOT touch the tumble dryer.
Does tumble dryer
operate after
pressing the reset
button for at least
one second?
Is there power
(5 Volts DC) between
H2-3 and H2-4 of
the reset button?
Disconnect
power to
tumble dryer.
Run a
continuity test
across the
reset switch.
Is it shorted?
Replace fire
suppression
system
control
board.
Replace reset
button.
Is the resistance for
both temperature
sensors within the
acceptable range?*
Sensor 1 H4-1 to H4-2
Sensor 2 H4-4 to H4-3
Replace fire
suppression
system
control board.
Yes
No
Retest.
(Extreme cold
weather will cause a
system shutdown.)
Refer to
Water Discharge
No Fire flowchart.
Yes
No
Acceptable resistance ranges from
150K Ohms to 19K Ohms in temperature
ranges from 40° to 120° F (4° to 48° C).
Reset fire
suppression
system
control.
Retest.
Replace
temperature
sensors.
No
Retest.
Replace
switch.
Reset fire
suppression
system
control.
Retest.
No
Yes
Yes
No
Yes
TMB2196N
*
Yes
TMB2196N
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