IBC VFC 15-150 Manual

5-7
TROUBLESHOOTING
VFC 15-150 - VFC 45-225 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/ame 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ow.Openmanualgasshutoff
and reset boiler.
Gap between igniter
probe and burner is
too large or too small.
Adjustgapbetweenigniterprobe/amesensor
and burner to a distance of 3/16" (turn off gas
supply and remove viewport for best visibility;
useproleof1/8"diameterignitorrodtogauge
distance)
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/amesensoris
electrically isolated from the vessel, and its
ceramic insulator is intact.
• Replaceignitionlead
• Replacesparkmodule
HI LIMIT ERROR
LCD Screen Message:
Error – Water High-Limit
Exceeded
Water temperature exceeds hi-
limit. Boiler in hard lockout. Will
reset in 1 hour. Consult service
technician.
Defective or
disconnected hi-limit
switch.
• Checkwiringtohi-limitswitchandcontrol
module.
• Checkhi-limitswitch.SeeSection 5.2.5.
VENT HI-LIMIT ERROR
LCD Screen Message:
Error - Vent High-Limit
Exceeded *** Call for service!
Vent temperature has exceeded
the vent limit switch. Boiler
in lockout. Consult service
technician.
• Checkwiringtoensuresensorisproperly
connected to control module.
• Checkforevidenceofanydamagetovent
system.
• Pushmanualresetbutton,maintainconstant
watch during boiler operation to evaluate
vent temperature at maximum operating
settings to ensure no unsafe condition exists,
e.g.maxuetemp.withinallowablelimitsfor
exhaust pipe material used.

IBC VFC 15-150 Specifications

General

Brand	IBC
Model	VFC 15-150
Category	Boiler
Language	English