SV9510/SV9520 SMARTVALVE™ SYSTEM CONTROLS
69-2014 14
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Table 9. Troubleshooting with LED Indicator Assistance.
LED Status Indicates Check/Repair
OFF No power to system control. 1. Line voltage input power at L1 and L2. connectors on
ST9160 Electronic Fan Timer (EFT) or 208907 Terminal
Board.
2. Low voltage (24V) power at 24 VAC and COM terminals
on ST9160 or Terminal Board.
3. Fuse on ST9160 EFT, if provided.
4. System wiring harness in good condition and securely
connected at both ends.
“Heartbeat”—
Alternating Bright
- Dim
Normal Operation.
This indication shows whenever the system is
powered, unless some abnormal event has
occurred.
—
2 Flashes Airflow proving switch remains closed longer than
30 seconds after a call for heat begins.
Combustion air blower is not energized until
airflow proving switch opens.
1. Airflow proving switch stuck closed.
2. Airflow proving switch miswired or jumpered.
3 Flashes Airflow proving switch remains open longer than
30 seconds after combustion air blower
energized.
System goes into 5-minute delay period, with
combustion blower off. At the end of the 5-minute
delay, another ignition cycle will begin.
1. Ignition system control switch must be in the ON posi-
tion.
2. Airflow proving switch operation, tubing, and wiring.
3. Obstructions or restrictions in appliance air intake or
exhaust flue system that prevent proper combustion air
flow.
4 Flashes Limit string open.
Combustion air blower is energized. If control
system includes ST9160 Electronic Fan Timer,
the heat speed circulating air fan will be
energized until the limit string resets.
1. Open manual reset or auto reset burner rollout switch.
2. Open high temperature or auxiliary limit switch.
3. Limit and rollout switch wiring in good condition and
securely connected.
5 Flashes Flame signal sensed out of proper sequence.
Combustion air blower is energized. If control
system includes ST9160 Electronic Fan Timer,
the heat speed circulation air fan will be
energized after the selected heat fan on delay.
Flame at main burner.
6 Flashes System Lockout.
After one hour lockout reset delay, control will
reset and initiate a new ignition sequence if the
call for heat is still present.
1. Gas supply off or at too low pressure to operate
appliance.
2. Damaged or broken HSI element.
3. Line voltage HOT leadwire not connected to L terminal
on ST9160 or Terminal Board.
4. Appliance not properly earth grounded.
5. Flame sense rod contaminated or in incorrect location.
6. HSI element located in incorrect position.
7. Hot surface element or flame sense rod wiring in good
condition and properly connected.
6+1 Flashes
a,c
Soft Lockout—Maximum retry count exceeded—
4 failed trials for ignition in this call for heat.
1. Gas supply off or at too low pressure to operate
appliance.
2. Damaged or broken HSI element.
3. Line voltage HOT leadwire not connected to L terminal
on ST9160 or Terminal Board.
4. Appliance not properly earth grounded.
5. Flame sense rod contaminated or in incorrect location.
6. HSI element located in incorrect position.
7. Hot surface element or flame sense rod wiring in good
condition and properly connected.
6+2 Flashes
a,b,c
Soft Lockout—Recycle count exceeds 5 on this
call for heat—last failure was Flame Sense Lost
During Run.
1. Gas supply pressure inconsistent or too low to operate
appliance with other gas appliances firing.
2. Appliances and appliance power supply not properly
earth grounded.
3. Flame sense rod contaminated, grounded to appliance
chassis, or in incorrect location.
4. HSI element and flame sense rod wiring in good condi-
tion and properly connected.
6+3 Flashes
a,b,c
Soft Lockout—Recycle count exceeds 5 on this
call for heat—last failure was Air Flow Proving
Circuit Opened During Run.
1. Inducer and inducer wiring.
2. Low line voltage power supply.
3. Airflow proving switch operation, tubing, wiring.
4. Obstructions or restrictions in appliance air intake or
exhaust flue system that prevent proper combustion
airflow.
5. Other devices (such as auxiliary limits) in the airflow
proving circuits.
6+4 Flashes
a,b,c
Soft Lockout—Recycle count exceeds 5 on this
call for heat—last failure was Limit Circuit Opened
During Run.
1. Open high temperature or auxiliary limit switch.
2. Open manual reset or auto reset burner rollout switch in
the limit circuit.
3. Limit and rollout switch wiring in good condition and
securely connected.
4. Circulating air fan wiring and operation.
5. Obstructions in appliance or duct work that prevent
proper circulation through heat exchanger.
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