8.3.3 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.
‘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.
For instructions on clearing errors, see Resetting a boiler
after a hi-limit temperature lockout on page 88 and
Resetting a boiler after a LWCO lockout on page 88.
DHW taking
too long to
heat.
Sensor may be under-
reading actual water
temp.
Check sensor engagement; note well is 15 cm / 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)
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