Door Open Indicator - ALLIANCE T30 Series Troubleshooting Manual

Micro Display Control Troubleshooting

52. Door Open Indicator

(1)
Is there voltage at
H2-1 on the Electronic
control?
NO
Is there power supplied
to the unit?
YES
(2)
Is there 120 VAC at input
of primary fuses?
YES
(3)
Is there 120 VAC at
output side of the
primary fuses?
YES
(4)
Is there 120 VAC across
terminals 1 & 2 of
transformer primary?
YES
(5)
Is there 24 VAC across
terminals 2 & 3 of
transformer
secondary?
YES
98
Gas, steam and electric heat.
Single and three phase power supply.
YES
Replace Control.
NO
Plug unit in and
start cycle.
Correct wiring
NO
between primary
fuses and power
supply.
NO
Replace primary
fuse(s).
Correct wiring
NO
between primary
fuses and
transformer.
NO
Replace
transformer.
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Reference voltage
checks to transformer
neutral.
Is there 24 VAC at
the input of the
secondary fuse?
Is there 24 VAC at
output side of
secondary fuse?
Is there 24 VAC at
N.O. of door
switch?
With door closed is
there 24 VAC to
COM of door
switch?
Is there 24 VAC at
N.O. of lint drawer
switch?
Is there 24 VAC at
COM of lint drawer
switch with lint
panel closed?
Correct wiring
between H2-1 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)
NO
Check for proper
operation replace if
necessary.
YES
TMB205S
TMB250S
70291301