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WARNING
Line Voltage Power
Can cause property damage,
severe injury or death.
Only a trained, experienced service
technician
Should perform this
troubleshooting.
4.
After LED flash code analysis and appliance repair are
complete, turn thermostat below room temperature for 10
seconds; turn the thermostat above room temperature to
initiate a new call for heat.
5.
Observe the ignition sequence; comparing it to the Sequence
of Operation shown in fig. 10. Allow the new ignition
sequence to proceed until appliance lights or an abnormal or
unexpected event is observed. See next section
Troubleshooting Without LED Indicator Assistance
(Appliance power or thermostat call for heat has cycled
since appliance failure occurred)
If
Combustion air
2 Flash code does not come on 30
blower does not
seconds after call for heat starts.
energize.
Combustion air
2 Flash code does come on 30 seconds
blower does not
after call for heat starts.
energize.
Combustion air
3 Flash code does not come on after 30
blower energized.
seconds.
3 Flash code comes
Combustion air blower turns off.
on 30 seconds after
combustion air
blower is energized.
Prepurge time has
HSI element does not glow red within 10-
expired.
15 seconds.
HSI element is
No other visible control system action.
glowing red.
1.
2.
3.
4.
5.
6.
7.
And
1.
2.
1.
2.
Wait for the prepurge time to expire
1.
2.
3.
4.
1.
2.
3.
Wait for HSI element warm up time to expire
Make sure the appliance power is on and any manually
operated gas cock on the appliance is open.
Remove the appliance burner compartment door.
Confirm that RW9510/RW9520; RW9610/RW9620 LED
indicator is flashing in a "bright-dim" sequence.
Make sure the ignition system control switch is in the ON
position.
Disconnect the system thermostat leadwires at the
Terminal Board.
Using alligator clips on a short jumper wire, jumper the R
and W terminals on the EFT or Terminal Board.
Observe the appliance operation, comparing it to the
Sequence of Operation shown in Fig. 10. Allow the
ignition sequence to proceed until the appliance lights or
an abnormal or unexpected event is observed.
Check the appliance as shown in the following table.
Check/Repair
Combustion air blower wiring
Combustion air blower
Airflow proving switch stuck closed
Airflow proving switch miswired or jumpered
Ignition system control switch must be in the ON position
Airflow proving switch stuck in open position
Airflow proving switch tubing and wiring
Obstructions or restrictions in appliance air intake or
exhaust flue system that prevent proper combustion air
flow
Broken or damaged HSI element
Broken or damaged HSI element leadwires
Failure to power HSI element
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