IBC VFC 15-150 Manual

INSTALLATION AND OPERATION INSTRUCTIONS
5-6
VFC 15-150 - VFC 45-225 MODULATING GAS BOILERS
5.3 TROUBLESHOOTING GUIDE
SYMPTOM DIAGNOSIS REMEDY
AIRFLOW ERROR
LCD Screen Message:
Error – Insufcient Air Flow -
Check Venting
Insufcient combustion airow;
soft error; will retry in 5 minutes
Check fan operation • Checkleadisattachedatfan.
• Cyclepoweroff/on;listenforfaninitialization.
If no action, focus your attention on the fan
itself.
Check for fouled
reference lines and air
sensor
• Checkclearvinylairreferencelinesbelow
gas valve for any sign of water. After
disconnecting from black sensor, blow clear.
Check for exhaust re-ingestion, or repeated
power interruptions .
• Ensurecondensatetrapisnotblocked.
• GotoAdvancedDiagnosticsandcheck
differential air pressure sensor (at rest and
with fan on). See Section 5.2.3.
Check achieved fan
power
In Advanced Diagnostics, during Pre-purge, Fan
Pressure (FP) should move close to Required
Pressure (RP); if FP only 120-150 vs. RP of
250 or 300, then check for actual vent system
blockage: (a) disconnect intake within boiler
case; (b) open burner then fan/gas valve looking
for debris.
Water noise in vent.
Excess condensate in
venting.
• Checkcondensatetrapforobstructions.
Removeobstructionsandrellcondensate
trap with water.
• Checkventlength,sizeandconguration,
particularly re: horizontal 2" piping.
WATERFLOW ERROR
LCD Screen Message:
Error - No Water Flow
Low water ow – soft error; will
retry in 5 minutes
Check pressure
sensors
• Checkwiring:waterpressuresensorsto
controller.
• Checkpressuresensors.SeeSection 5.2.4
– 2nd paragraph.
Check for proper
piping
Refer to Section 1.6 Water Piping for
recommended piping installation.
Check primary pump If there is a valve on the primary loop, close it
andlistenforcavitation(evidenceow).Ifnot,
go to Installer Setup; select pump purge “on” to
run pumps without a heat call - check for heat
buildupatpumpbody(indicatesnoow).
Check for restriction
in water pipe
Check temperature differential across heat
exchangeratlow–mediumringrateifpossible.
Examine air strainer components for scale.
WARNING
Never attempt to repair
the control module (circuit
board). If the control module
is defective, replace it
immediately.
5.3.1 Using Control Module Errors Displayed

IBC VFC 15-150 Specifications

General

Brand	IBC
Model	VFC 15-150
Category	Boiler
Language	English