09 Fault Code
YES
Allow !me for inducer limit to cool.
Verify ven!ng and vent termina!ons
are within allowable lengths and clear
of any obstruc!ons.
Is Inducer Limit cool
and contacts closed?
Replace Inducer Limit switch.
Check opera!on
Defini!on:
Condensate Pressure Switch Open: The condensate system is
not free flowing and opened the safety switch OR
Inducer Limit: This error is normally caused by improper
installa!on or applica!on of the furnace ven!ng system.
Is 24 VAC measured
across inducer limit
switch?
Inducer limit switch is
open.
Make a call for 1
st
stage hea!ng
Is 24 VAC measured
across condensate
pressure switch?
Correct condensate
drain system
YES
NO
Possible Causes:
Incorrect Limit switch installed
Inducer malfunc!on
Heat exchanger malfunc!on
YES
Replace IFC
Are ven!ng and vent
termina!ons are within
allowable limits and
clear any obstruc!ons.
NO
YES
Correct ven!ng
system
NO
10 Fault Code
DEFINITION:
Internal control board error.
Communica!on error
between the inducer and
blower motor micro-
processors
Replace IFC
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