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Electronic Control Troubleshooting
32. Will Not Start/Continue Running – OPL Microprocessor Control
(continued)
TMB1824S
Is there voltage at
terminal 7 on OPL
Micro?
Is
there voltage
across terminals
B & A of motor control relay
for OM model and terminals
0 & 1 for RM
models?
voltage at terminal
Is there
5 on the motor control
relay for OM models and
terminal 2 for RM
models?
Is there
voltage across
terminals 5 & 8 of
the motor control relay for OM
models and terminals 2
& 4 for RM
models?
Is there voltage
across terminals
1 & 4 of fan
motor?
Does the fan
motor run?
Is there voltage to
terminal 6 of motor
control relay?
Is there voltage
across terminals 6 & 9 of
motor control relay?
Replace OPL Micro.
Correct wiring to
motor control relay.
Correct wiring
between motor
control relay and
power supply.
Replace motor
control relay.
Correct wiring
between fan motor
and motor control
relay.
Replace fan motor.
Correct wiring
between terminal
6 motor control
relay and supply
voltage.
Replace motor
control relay.
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Tests conducted with cycle selected and
start key pad activated.
Reference voltage to
supply neutral.
Does the unit
have reversing
capabilities?
See cylinder
rotation. Either
forward or reverse.
YES
NO
Replace motor
control relay.
Correct wiring
between L1, L2 and
power supply.
Is unit supplied with
single phase or three
phase power?
Is there voltage to L1
and L2 of the motor
control relay?
Is there voltage to T1
and T2 of the motor
control relay?
Three phase. Gas and steam.
Refer to Note on next page.
Three phase. Gas and steam.
Refer to Note on next page.
NO
YES
NO
YES
Single phase
Does the unit
have single
phase or three
phase supply?
Correct wiring
between L2, L3 and
power supply.
NO
YES
Is
there voltage
to T2 and T3 on
the motor control
relay?
Is
there voltage
to L2 and L3 on
the motor control
relay?
Replace motor
control relay.
NO
Continued on next
page.
NO
Single phase
TMB1824S