7.4.3 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)
7.4.3 Miscellaneous issues
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