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70291301
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Electronic Control Troubleshooting
42. Will Not Heat – Electric/Gas – OPL Microprocessor (continued)
T011D
Is there voltage to
COM of lint panel
switch with lint panel
closed?
Is there voltage at
terminal 8 of OPL
Micro?
Check for proper
operation and
replace lint panel
switch if necessary.
Correct wiring
between terminal
8 of OPL Micro
and COM of lint
panel switch.
YES
YES
NO
NO
Replace OPL Micro.
Correct wiring
between terminal
6 & 13 on OPL
Micro.
Is there voltage to
terminal 13 of OPL
Micro?
Is there voltage at
terminal 6 of OPL
Micro?
Replace OPL Micro.
NO
NO
YES
YES
Column 1
Correct wiring
between COM &
OPL Micro.
Is there voltage at
COM of airflow
switch?
Check for proper
operation and
replace if
necessary.
Is there voltage at
N.C. terminal of
airflow switch?
Correct wiring
between terminal
7/8 of motor
control relay and
N.C. of airflow
switch.
Replace motor
control relay.
there voltage at
terminal 4 of motor
control relay for OM
models or terminal 6
for RM
Correct wiring
between fan motor
centrifugal switch
and motor control
relay.
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
Replace fan motor.
Is there voltage at
terminal 5 of fan
motor centrifugal
switch?
Column 2
Continued on next
page.
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
The following tests are
conducted with the unit running
and calling for heat.
Is the unit supplied with
single phase or three
phase power?
single phase
Is there voltage to
terminal 14 on motor
control relay?
Is there voltage across
terminals 14 & 13 of
motor control relay?
Correct wiring
between terminal
14 on motor
control relay and
N.C. terminal of
airflow switch.
Replace motor
control relay.
Three phase
NO
YES
NO
YES
T011D
Is
models?
there voltage at
terminal 7 of motor
control relay for OM
models or terminal 8
for RM
Is
models?