A base
IOM67 12 February 2021 R0
Combustion blower air
switch input (CB) has no
power for 60 seconds
after commanding the
combustion blower on /
Combustion blower air
switch input has no power
for 2 seconds during main
flame.
Combustion blower air
switch input has power for
10 seconds before the
combustion blower has
been commanded on.
Blocked condensate
sensor reads less than
7kohms for more than 5
minutes.
High limit safety tripped
due to excessively high
temperature.
Blocked flue input has
opened for more than 1
minute.
Occurs if the pressure
drops below the low
pressure setpoint during
modulation for more than
40 seconds
Occurs if the pressure
goes above the High
pressure setpoint during
modulation for more than
90 seconds
Air flow too low to enable
heating.
Unable to zero the
pressure before the
damper has opened.
Occurs if the pressure
drops below the very low
pressure setpoint after
the purge has been
completed.
Occurs if a secondary
flame rod is enabled and
flame sensing is lost in less
than 20 seconds after the
pilot valve drops out on
consecutive attempts.
Tank High
Pressure
Overflow
Measuring elevated drain
temperature when not
draining.
Erratic water level probe
sensing .
Expected time to fill to
water level probes not
achieved.
Expected time to clear
water level probes not
achieved.
On fill, probe sensing is
reversed.
Duct humidity high limit
open.
NTC Type 2 drain sensor
outside of range.
Expected time to clear Full
Water Probe not
achieved.
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