5-7
TROUBLESHOOTING
SL 30-175, SL 45-260 MODULATING GAS BOILERS
SYMPTOM
DIAGNOSIS
REMEDY
MAxIMUM IGNITION TRIALS
ERROR
LCD Screen 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 control
module 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 as follows:
With Capable Controls ignition module – 3/16”
(5mm)
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
vENT HI-LIMIT ERROR
LCD Screen Message:
Error - Vessel/Vent High-Limit
Exceeded *** Call for service!
Vent temperature has exceeded
the vent limit switch or the
upper vessel high limit has
been tripped. Boiler in lockout.
Consult service technician.
Indicates one or both
switches has tripped.
• Check wiring to ensure switches are properly
connected to control module.
• Check for evidence of any damage to vent
system and signs of excess heat near
switches.
• Push manual reset button(s), maintain
constant watch during boiler operation
to evaluate vent/cabinet temperatures at
maximum operating settings. ensure no
unsafe condition exists, e.g. max flue temp.
or heat escapement at the burner flange.
Summary of Contents for SL 30-175
Page 76: ...NOTES...