INSTALLATION AND OPERATION INSTRUCTIONS
5-6
SL 80-399 MODULATING GAS BOILER
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
5.3 TROUBLESHOOTING
SYMPTOM
DIAGNOSIS
REMEDY
MAXIMUM IGNITION TRIALS
ERROR
Touchscreen Message
:
Error – Ignition Failure after 3
tries
Boiler has failed to ignite on 3
successive attempts. Boiler in
lockout for 1 hour, then repeats
3-try seq. Consult service
technician if error recurs.
No spark when igniting.
Igniter probe/flame
sensor disconnected.
Check that igniter lead is secure at the touchscreen
controller and at the probe.
Manual gas shutoff is
closed or gas line not
fully purged.
Check for gas flow. Open manual gas shutoff and
reset boiler.
Gap between igniter
probe rods is too large
or too small.
Adjust ignitor probe rod gap between 1/8th and
3/16th (3.2-4.7 mm)
Spark, but no ignition.
Check spark module is sending power to gas valve
– close gas supply, then disconnect (black) electric
housing from face of gas valve, gently spread plastic
tabs to open, and look for 24vac voltage between blue
and brown wires during an ignition cycle. Replace
module if no current detected
Boiler ignites, but shuts
off at the end of the
ignition trial. Improperly
grounded pressure vessel/
burner or unserviceable
ignition lead or spark
module.
• Ensure pressure vessel is grounded.
•
Check the igniter probe/flame sensor is electrically
isolated from the vessel, and its ceramic insulator
is intact.
• Replace ignition lead
• Replace spark module
HI LIMIT CUTOFF
TEMPERATURE ERROR
Touchscreen message:
Error – Water High-Limit
Exceeded
Water temperature
exceeds hi-limit. Boiler
in hard lockout.
See Section 5.2.4.
5.3.1 Using Control Module Errors Displayed
The bottom line of the touchscreen is reserved for displaying the boiler's error status. The
boiler status bar will normally be Green, but can change color to Yellow or Red. The colors
represent the following boiler operating status. The text inside the bar will indicate the
specific warning or alarm. If there is more than one alarm present the text will scroll slowly
through all current alarm conditions.
• Green – Normal
• Yellow – Warning
• Red – Alarm
WARNING
Never attempt to repair the
control module (circuit board). If
the control module is defective,
replace it immediately.
