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Hybrid Timer Control Troubleshooting
39. Unit Will Not Heat – Gas – Coin Models
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
Correct wiring
between FS-2 and
NO of lint panel.
Is there voltage at
FS-2 of hybrid control?
Is there voltage
at FS-1 of hybrid
control?
Correct wiring
between COM of
airflow switch and
FS-1 of hybrid
control.
Is there voltage at COM
of airflow switch?
Check for proper
function of airflow
switch and replace if
necessary.
Is there voltage across
COM & NO terminal
of airflow switch?
Correct wiring
between terminal 7
on motor control
relay and NO
terminal on airflow
switch.
Is there voltage at
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 at
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?
Correct wiring
between stove limit 1
and cabinet limit.
Is there voltage to the
input side of the stove
limit 1?
NO
YES
Is the
thermistor
operational?
Replace hybrid
control.
Replace
thermistor.
YES
NO
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
Содержание YT025E
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