Control Has No Display - ALLIANCE T30 Series Troubleshooting Manual

Micro Display Control Troubleshooting

51. Control Has No Display

(1)
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 1 &
4 of transformer
secondary?
YES
96
Gas, steam and electric heat.
Single and three phase power supply.
NO
Plug unit in and
start cycle.
Correct wiring
NO
between primary
fuse and power
supply.
NO
Replace primary
fuse(s).
Correct wiring
NO
between primary
fuse and
transformer.
NO
Replace
transformer.
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(6)
NO
Is there 24 VAC at
the input of the
secondary fuse?
YES
(7)
NO
Is there 24 VAC at
output side of
secondary fuse?
YES
(8)
NO
Is there 24 VAC across
H1-1 & H1-3 on
the control?
YES
Correct wiring
between control and
secondary fuse.
Correct wiring
between secondary
fuse and
transformer.
Replace secondary
fuse.
Replace Electronic
Control.
TMB249S
70291301