Honeywell SmartValve SV9540 Installation Instructions Manual page 13

4. After LED flash code analysis and appliance repair are complete, turn the 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. 12. 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.
WARNING
LINE VOLTAGE POWER
CAN CAUSE PRODUCT DAMAGE, SEVERE INJURY OR DEATH
Only a trained, experienced service technician should perform this troubleshooting.
1. Make sure the appliance power is on and any manually operated gas cock on the appliance is open.
2. Remove appliance burner compartment door. Confirm that SV9540; SV9640 LED indicator 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 EFT or Terminal Board.
6. Observe the appliance operation, comparing it to the Sequence of Operation shown in Fig. 12 . Allow the ignition sequence
to proceed until the appliance lights or an abnormal or unexpected event is observed.
7. Check the appliance as shown in the following table:
If
Combustion air blower does
not energize.
Combustion air blower does
not energize.
Combustion air blower is
energized.
3 Flash code comes on 30
seconds after combustion
air blower is energized.
Prepurge time has expired.
HSI element is glowing red.
Pilot lights during trial for
ignition.
And
2 Flash code does not come on 30
seconds after call for heat starts.
2 Flash code does come on 30
seconds after call for heat starts.
3 Flash code does not come on
after 30 seconds.
Combustion air blower turns off.
HSI element does not glow red
within 5 seconds.
Pilot does not light during the 90
second trial for ignition.
NOTE: HSI element will turn off
for approximately 25
seconds during the 90
second trial for igniton.
Main gas does not flow.
If pilot flame is not sensed during
trial for ignition, main valve will not
open. System will shut off HSI
element and pilot gas flow, go
through a 5 minute delay period,
then initiate another ignition trial.
SV9540; SV9640 SmartValve™ SYSTEM CONTROLS
1. Combustion air blower wiring
2. Combustion air blower
1. Airflow proving switch stuck closed.
2. Airflow proving switch miswired or
jumpered.
Wait for the prepurge time to expire
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
1. Broken or damaged HSI element
2. Broken or damaged HSI element leadwires
3. SV9540; SV9640 failure to power HSI
element.
1. Pilot tubing not purged of air [Intiate
another ignition sequence with the R-W
jumper to clear pilot tubing more quickly]
2. Inlet gas pressure too low for proper
appliance 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.
1. Line voltage to L1 terminal of ST9160 or
Terminal Board must be 120 volts with
reference to appliance chassis.
2. Appliance must be reliably connected to
earth ground.
3. Combustion air blower moving pilot flame
away from pilot burner flame rod.
4. Inlet gas pressure too low for proper flame
sensing.
5. Flame sense rod contaminated or in
incorrect location.
6. Wiring between SV9540; SV9640 and
pilot burner must be in good condition and
properly connected.
13
Check/Repair
.
69-1059