8.4.3 Miscellaneous issues
Miscellaneous issues
Issue Diagnosis Fix
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 Cutoff won’t
clear.
Boiler is in 1 hour safety
lockout.
Reset safety device and cycle boiler
power off and on to reset error.
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 set too
close to the required DHW temperature.
Boiler output not
modulating up to
maximum despite target
not being reached.
Possible flow issue:
check for 35 or 40 °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 touchscreen controller)
8.4.3 Miscellaneous issues
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