IBC SL 20-160 G3, Installation And Operating Instructions Manual

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5-11
TROUBLESHOOTING
SL 20-115 G2 MODULATING GAS BOILER
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
5.3.5 Miscellaneous
SYMPTOM DIAGNOSIS REMEDY
FUMES AND HIGH HUMIDITY Improperly installed
condensate trap
Refer to installation/operation instructions
Leak in vent piping Inspect using soap solution
Flue gas leak within boiler Visually inspect all mechanical connections
BOILER STUCK ON
INITIALIZE
Fan board failure Replace fan.
‘GHOST’ CALL FOR HEAT. Triac or ‘Power-robbing’
thermostat sending current to
boiler.
Remove Therm. connections from boiler to confirm
that stray voltage, or current induced in thermostat
wiring, is source of nuisance signal. Replace the
Power Robbing thermostat, isolate the thermostat
with a relay or install a properly sized resistor
(consult the thermostat manufacturer first then IBC
for instructions).
ERROR: WATER HIGH LIMIT /
LOW WATER CUT-OFF WON’T
CLEAR.
Boiler is in 1 hour safety
lockout.
Reset safety device and clear the error in the
Advanced Diagnostics menu.
DHW TAKING TOO LONG TO
HEAT.
Sensor may be under-reading
actual water temp.
Check sensor engagement; note well is 15cm /
almost 6 inches deep and sensor must be fully set
to back. Check programmed settings boiler temp is
not set too close to the required DHW temp
BOILER OUTPUT NOT
MODULATING UP TO
MAXIMUM DESPITE TARGET
NOT BEING REACHED.
Possible flow issue: check for
35 or 40 degree F temperature
difference between boiler
supply and return water
temperatures (evokes
electronic fence).
Confirm that primary pump is able to overcome
head loss of boiler and primary loop piping at the
required flow rate.
PRIMARY PUMP RUNS BUT
LOAD PUMPS DO NOT.
Wiring not complete. Supply power to the PV/L and PV/N terminals from
the incoming power supply to the boiler. (Factory
wired on boilers with a factory installed Touch
Screen Controller)
PRIMARY PUMP RUNS
DURING PARALLEL-PIPED
DHW CALL.
Boiler pump set to on. Re-define DHW load as DHW Loop 2 (5 button
Controls) to turn off primary pump during domestic
hot water calls. On Touch Screen Controllers set
the boiler pump to off in the Installer Set-up Menu.