ALLIANCE T30 Series Troubleshooting Manual page 80

Electronic Control Troubleshooting
42. Will Not Heat – Electric/Gas – OPL Microprocessor (continued)
Column 1
Is there voltage to
COM of lint panel
switch with lint panel
closed?
YES
Is there voltage at
terminal 8 of OPL
Micro?
YES
Is there voltage to
terminal 13 of OPL
Micro?
YES
Is there voltage at
terminal 6 of OPL
Micro?
YES
Replace OPL Micro.
Is there voltage to
terminal 14 on motor
control relay?
YES
Is there voltage across
terminals 14 & 13 of
motor control relay?
YES
Replace motor
control relay.
78
Check for proper
NO operation and
replace lint panel
switch if necessary.
Correct wiring
between terminal
NO
8 of OPL Micro
and COM of lint
panel switch.
NO
Replace OPL Micro.
Correct wiring
NO
between terminal
6 & 13 on OPL
Micro.
Correct wiring
between terminal
NO 14 on motor
control relay and
N.C. terminal of
airflow switch.
NO
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Column 2
Is there voltage at
COM of airflow
switch?
YES
Is there voltage at
N.C. terminal of
airflow switch?
YES
Three phase
Is the unit supplied with
single phase or three
phase power?
single phase
Is
there voltage at
terminal 7 of motor
control relay for OM
models or terminal 8
for RM
models?
YES
Is
there voltage at
terminal 4 of motor
control relay for OM
models or terminal 6
for RM
models?
YES
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
YES
Is there voltage at
terminal 5 of fan
motor centrifugal
switch?
YES
Continued on next
page.
The following tests are
conducted with the unit running
and calling for heat.
Correct wiring
NO
between COM &
OPL Micro.
Check for proper
NO
operation and
replace if
necessary.
Correct wiring
between terminal
NO
7/8 of motor
control relay and
N.C. of airflow
switch.
NO Replace motor
control relay.
Correct wiring
between fan motor
NO
centrifugal switch
and motor control
relay.
NO
Replace fan motor.
T011D
T011D
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