69-1383 G.R. 7-00
www.honeywell.com
Home and Building Control
Home and Building Control
Honeywell Inc.
Honeywell Limited-Honeywell Limitée
Honeywell Plaza
155 Gordon Baker Road
P.O. Box 524
North York, Ontario
Minneapolis, MN 55408-0524
M2H 3N7
SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
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.
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 10. Troubleshooting Without LED Indicator Assistance (Continued).
LED Flash
Code
Indicates
Check/Repair