Service manual

104 70304901
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Hybrid Timer Control Troubleshooting
40.Unit Will Not Heat – Steam – OPL Models (T30 Models Only)
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
Correct wiring
between terminal 7
on motor control
relay and N.C.
terminal on airflow
switch.
Is there voltage on
terminal 13 of motor
control relay?
Replace motor
control relay.
Is there voltage across
terminals 13 & 14 of
motor control relay?
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
Is there voltage on
terminal 3 of fan
motor centrifugal switch?
Replace fan motor.
Is there voltage across
terminals 3 & 5 of
fan motor centrifugal switch?
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
Is there voltage to the
input side of the
cabinet limit?
Replace cabinet
limit.
Is there voltage across
cabinet limit?
NO
YES
NO
YES
NO
NO
YES
YES
NO
YES
YES
NO
(3)
(4)
(5)
(6)
(7)
Correct wiring
between steam
valve and cabinet
limit.
Is there voltage across
the coil of the steam valve?
NO
YES
(8)
Does the steam valve
open allowing steam to flow?
Unit operational.
Replace or rebuild
steam valve.
No
TMB2007S
Is the
thermistor
operational?
Replace hybrid
control.
Replace
thermistor
NO
NO
YES
YES
(2)
(1)
Is there
voltage at H4-1
of hybrid control?
TMB2007S