SV9440, SV9540, AND SV9640 SMARTVALVE™ SYSTEM CONTROLS
69-1227—02
18
4.
After LED flash code analysis and appliance repair
are complete, turn the thermostat below room tem-
perature 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. 14 or Fig. 15.
Allow the new ignition sequence to proceed until
appliance lights or an abnormal or unexpected
event is observed.
Troubleshooting Without LED
Indicator Assistance (ST9160 Only)
Appliance power or thermostat call for heat has cycled
since appliance failure occurred.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Only a trained, experienced service technician
should perform this troubleshooting.
1.
Make sure the appliance power is on and any man-
ually operated gas cock on the appliance is open.
2.
Remove appliance burner compartment door. Con-
firm that the SV9440, SV9540 or SV9640 LED indi-
cator is flashing in a bright-dim sequence.
3.
Make sure the ignition system control switch is in
the ON position.
4.
Disconnect the system thermostat leadwires at the
ST9160 EFT or the 208907 Terminal Board.
5.
Using alligator clips on a short jumper wire, jumper
the R and W terminals on the ST9160 EFT or termi-
nal board.
6.
Observe the appliance operation, comparing it to
the Sequence of Operation shown in Fig. 14. Allow
the ignition sequence to proceed until the appli-
ance lights or an abnormal or unexpected event is
observed.
7.
Check the appliance as shown in Table 11.
Table 11. Troubleshooting without LED indicator assistance for ignition controls using an ST9160 Fan Timer or
208907 Terminal Board.
If
And
Check/Repair
Combustion air blower
does not energize.
2 flash code does not come on 30 seconds after call
for heat starts.
1.
Combustion air blower wiring.
2.
Combustion air blower.
3.
Wiring between ST9160 and SV9540.
Combustion air blower
does not energize.
2 flash code does come on 30 seconds after call for
heat starts.
1.
Airflow proving switch stuck closed.
2.
Airflow proving switch miswired or jumpered.
Combustion air blower is
energized.
3 flash code does not come on after 30 seconds.
Wait for the prepurge time to expire.
3 flash code comes on 30
seconds after combustion
air blower is energized.
Combustion air blower turns off.
1.
Ignition system control switch must be in the
ON position.
2.
Airflow proving switch stuck in open position.
3.
Airflow proving switch tubing and wiring.
4.
Obstructions or restrictions in appliance air
intake or exhaust flue system that prevent
proper combustion air flow.
Prepurge time has expired. HSI element does not glow red within 5 seconds.
1.
Broken or damaged HSI element.
2.
Broken or damaged HSI element lead-
wires.
3.
SV9440, SV9540 or SV9640 failure to power
HSI element.
HSI element is glowing
red.
Pilot does not light during the 90-second trial for
ignition.
NOTE: HSI element turns off for approximately 25
seconds during the 90 second trial for ignition.
1.
Pilot tubing not purged of air. (Initiate
another ignition sequence with the R-W
jumper to clear pilot tubing more quickly.)
2.
Inlet gas pressure too low for proper appli-
ance operation.
3.
Pilot burner improperly positioned in airflow.
4.
Clogged or incorrect pilot orifice.
5.
Combustion air blower moving pilot gas away
from HSI element.