Control Display - Door Open Light "On - ALLIANCE T30 Series Troubleshooting Manual

Electronic Control Troubleshooting
21. Control Display – Door Open Light "On"
Is there voltage at
H4-6 on the electronic
control?
NO
Is there power supplied
to the unit?
YES
Is there voltage to input
of primary fuses?
YES
Is there voltage to
output side of the
primary fuses?
YES
Is there voltage across
terminals 1 & 2 of
transformer primary?
YES
Is there voltage across
terminals 2 & 3 of
transformer
secondary?
YES
38
Single and stacked
units. Gas and electric
checks to transformer
heat. Single and three
phase supply.
(1)
YES
Replace electronic
control.
NO
Plug unit in and
run it.
(2)
Correct wiring
NO
between primary
fuses and power
supply.
(3)
NO
Replace primary
fuse(s).
(4)
Correct wiring
NO
between primary
fuses and
transformer.
(5)
NO
Replace
transformer.
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Reference voltage
neutral.
Is there voltage at
the input of the
secondary fuse?
Is there voltage to
output side of
secondary fuse?
Is there voltage to
N.O. of door
switch?
With door closed is
there voltage to
COM of door
switch?
Is there voltage to
N.O. of lint drawer
switch?
Is there voltage to
COM of lint drawer
switch with lint
panel closed?
Correct wiring
between H4-6 of
electronic control and
COM of lint drawer
switch.
(6)
Correct wiring
NO
between secondary
fuse and
transformer.
YES
(7)
NO
Replace secondary
fuse.
YES
(8)
Correct wiring
NO
between N.O. and
output of secondary
fuse.
YES
(9)
Check for proper
NO
function of door
switch replace if
necessary.
YES
(10)
Correct wiring
NO
between N.O. on lint
drawer and COM on
door switch.
YES
(11)
Check for proper
NO
operation replace if
necessary.
YES
T028D
T028D
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