SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
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14
a
The 6+X designation indicates a combination of flash codes: 6 flashes show the control is in soft lockout, followed by
X flashes to indicate the reason for soft lockout. When the 6+X code is flashed, the SV9520 will attempt a new ignition
sequence after one hour, if the call for heat is still present. Reset of the thermostat will initiate a new ignition sequence
immediately.
b
Any combination of 5 abnormal events during a single call for heat will result in soft lockout. An abnormal event is a
Flame Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The
flash code will indicate which was the last abnormal event that put the system into the soft lockout state based on the
table above.
Turning off the Appliance
Vacation Shutdown—
Set the thermostat to the desired room temperature while
you are away.
Complete Shutdown—
Turn off power to the appliance. Turn off the gas supply to
the appliance. Appliance will completely shut off. Follow
the procedure in the Instructions to the Homeowner
section above to resume normal operation.
6+3
Flashes
a,b
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
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.
6+5
Flashes
a
Soft Lockout—Flame has gone away after
Error Code 5 (Flame sensed out of
sequence).
1. Cycle call for heat. Check for flame at main burner after
call for heat ends.
2. If no flame visible and Flash Code 5 repeats, replace
SmartValve.
6+6 Flashes Not Used
6+7
Flashes
a
Soft Lockout—Valve drive hardware self-
check failure.
Cycle call for heat. If 6+7 Flash Code repeats, replace
SmartValve.
10
Line input voltage polarity reversed at
SV9520.
1. Line voltage power supply correct and properly
connected to ST9160 EFT.
2. Appliance chassis earth grounded to Green (earth
ground) lead of line voltage power supply.
3. EFT To SmartValve wiring correct (see Fig. 7).
Table 9. Troubleshooting With LED Indicator Assistance (Continued).
LED Flash
Code
Indicates
Check/Repair