Will Not Heat - Steam - Opl Microprocessor - ALLIANCE T30 Series Troubleshooting Manual

Electronic Control Troubleshooting
48. Will Not Heat – Steam – OPL Microprocessor
Testing conducted with unit
running and calling for heat.
Is there votlage at
terminal 5 on OPL
Micro?
NO
Is the thermister
operating properly?
YES
Is power supplied to
unit?
YES
Is there voltage to input
of primary fuse(s)?
YES
Is there voltage to
output of primary
fuse(s)?
YES
Is
there voltage across
terminals 1 & 2 on
primary of
transformer?
YES
90
Reference voltage to
transformer neutral
terminal 3.
YES
Continued on next
page column 2.
NO
Replace thermister.
Reference voltage to
supply neutral.
NO
Connect supply
and run unit.
Correct wiring
NO
between primary
fuse and supply.
NO
Change primary
fuse.
Correct wiring
NO
between transformer
and primary fuse.
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Is there voltage across
NO
terminals 2 & 3 of
transformer
secondary?
YES
Note: Reference voltage to
transformer secondary neutral
terminal 3.
NO
Is there voltage to input
of secondary fuse?
YES
Is there voltage to
NO
output of secondary
fuse?
YES
Is there voltage to
NO
N.O terminal of door
switch?
YES
With door closed is
NO
there voltage to COM
of door switch?
YES
Is there voltage to
NO
N.O. of lint panel
switch?
YES
Continued on next
page column 1.
Replace
transformer.
Correct wiring
between secondary
fuse and
transformer.
Replace secondary
fuse.
Correct wiring
between N.O.
terminal of door
switch and
secondary fuse.
Check for proper
operation, replace
door switch if
necessary.
Correct wiring
between N.O. of
lint panel switch
and COM of door
switch.
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