No Heat - Gas
NOTE: When calling for heat the holding coil, the booster coil and the igniter will be energized. Once the sensor
senses that the igniter is hot enough for ignition, it will open. At this time the holding coil and the secondary coil
will be energized allowing gas to flow. If the flame cycles on and off check for proper operation of sensor. If gas
never ignites, check for problems with the coil and check to see if the sensor opens. If coils are good and the
sensor opens with the glow bar operational and there is no ignition/gas flow, replace the gas valve.
(1)
Is there voltage
across the pink wire
of the gas valve to
terminal 2 on the
motor?
(2)
Is there voltage at
the output of the
limit thermostat
referenced to neutral?
No
Refer to Note.
Yes
(3)
Is there voltage to
the input of the
limit thermostat
referenced to neutral?
Correct wiring
between limit
thermostat and gas
valve.
Yes
(4)
Is there voltage
across N.O. and H1-4
(neutral) on the
control?
Check for proper air
flow making sure
venting is not
blocked and lint
screen is clean.
Reset or replace
limit thermostat.
Yes
(5)
Is there voltage
across COM and H1-4
(neutral) on the
control?
Correct wiring
between FS-1 and
limit thermostat.
Yes
Refer to Door Open
troubleshooting.
Make sure unit is
calling for heat.
Check operation of
thermistor. Replace
I/O control.
Yes
(6)
Is there voltage
across terminal 1 of
the motor and L1?
Correct wiring to the
motor.
Check for proper
operation of
centrifugal on the
motor. Replace motor
if necessary.
Yes
Replace either the
gas valve, coils of
gas valve or the
sensor.
Electronic Control Troubleshooting
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Copyright, Alliance Laundry Systems LLC -
DO NOT COPY or TRANSMIT
47
Part No. D515519R3
Summary of Contents for BD3NGBGS303EW01
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