69-1059
12
SV9540; SV9640 SmartValve™ SYSTEM CONTROLS
TROUBLESHOOTING
Troubleshooting with LED Indicator Assistance
No cycling of appliance power or thermostat call for heat since appliance failure has occurred.
WARNING
LINE VOLTAGE POWER
CAN CAUSE PRODUCT DAMAGE, SEVERE INJURY OR DEATH
Only a trained, experienced service technician should perform this troubleshooting.
1. Check the system thermostat to make sure it is calling for heat. (Do not cycle the thermostat on and off at this time.)
2. Remove the appliance burner compartment door. Do not interrupt power to the SV9540; SV9640 by opening any
electrically interlocked panels.
3. Observe the LED indicator on the SV9540; SV9640; check and repair system as noted in the following chart:
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 is in good condition
and securely connected at both ends.
Bright—Dim
Normal Operation
This indication shows whenever the system is
powered, unless some abnormal event has
occurred.
Not Applicable
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 air 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 position.
2.
Airflow proving switch operation, tubing, and
wiring.
3.
Obstructions or restrictions in appliance air
intake or exhaust flue system that prevent
proper combustion airflow.
4 Flashes
Limit string is 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 is 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 circulating air fan will be
energized after the selected heat fan on delay.
Flame at pilot burner.
6 Flashes
System Lockout
After 5 minute delay time, control system 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
L1 terminal on ST9160 or Terminal Board.
4.
Appliance not properly earth grounded.
5.
Flame sense rod contaminated or in incorrect
location.
6.
Pilot burner located in incorrect position.
7.
Pilot burner leadwires are in good condition
and properly connected.
