SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
15
69-1383
Table 10. Troubleshooting Without LED Indicator Assistance .
LED Flash
Code
Indicates
Check/Repair
OFF
Control not powered.
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 24VAC and COM terminals
on ST9160 or Terminal Board.
3. Low voltage (24 Vac) power at SmartValve C1, pins 6
and 7 (See Fig. 7 or Fig. 8).
4. Fuse on ST9160 EFT; if provided.
5. System wiring harness in good condition and securely
connected at both ends.
“Heartbeat”
(alternating
bright/dim)
Normal Operation (Standby, call for heat,
call for cool, etc.).
2 Flashes
Pressure switch closed when should be
open—system waits until pressure
switch opens, then proceeds with ignition
sequence.
1. Airflow proving switch stuck closed.
2. Airflow proving switch miswired or jumpered.
3 Flashes
Pressure switch circuit was still sensed
as open 30 seconds after the inducer
was energized. System is in 5-minute
delay mode, with inducer off. After 5-
minute delay, new ignition sequence is
initiated.
NOTE: SmartValve On/Off switch in OFF
position during a call for heat generates
this flash code.
1. Move SmartValve control switch to ON>
2. Inducer and inducer wiring.
3. Low line voltage power supply.
4. Airflow proving switch operation, tubing, wiring.
5. Obstructions or restrictions in appliance air intake or
exhaust flue system that prevent proper combustion air
flow.
6. Other devices (such as auxiliary limits) in the airflow
proving switch circuit.
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.
System waits for limit string to close,
then initiates a new ignition sequence.
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 circuit wiring in good condition
and securely connected.
4. Circulating air fan wiring and operation.
5 Flashes
Flame signal sensed out of proper
sequence (with flame signal still
present).
Combustion blower energized. If control
system includes ST9160 EFT, the heat
speed circulation air fan will be
energized after the selected heat fan on
delay. System waits for flame signal to
disappear, then goes to Soft Lockout.
See Flash Code 6+5;
Flame at main burner.
6+1 Flashes
a
Soft Lockout—Maximum retry count
exceeded—4 failed trials for ignition in
this call for heat.
1. Gas supply off or supply pressure too low to operate
appliance.
2. Damaged or broken HSI element.
3. Appliance and appliance power supply not properly
earth grounded.
4. Flame sense rod contaminated, grounded to appliance
chassis, or in incorrect location.
6. HSI element and flame sense rod wiring in good
condition and properly connected.
6+2 Flashes
a,b
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 rot wiring in good
condition and properly connected.