45
D
IagnostIc
c
Hart
WARNING
H
IgH
Voltage
!
t
o
aVoID
Personal
InjurY
or
DeatH
Due
to
electrIcal
sHock
,
DIsconnect
electrIcal
Power
Before
PerforMIng
anY
serVIce
or
MaIntenance
.
Refer to the
Troubleshooting Chart
in the back of this
manual for assistance in determining the source of unit
operational problems. The 7-segment LED displays will
display an error code that may contain a letter and number.
The error code may be used to assist in troubleshooting
the unit.
r
esettIng
f
roM
l
ockout
Furnace lockout results when a furnace is unable to
achieve ignition after three attempts during a single call for
heat. It is characterized by a non-functioning furnace and
an
EE0
code displayed on the 7-segment display. If the
furnace is in “lockout”, it will (or can be) reset in any of the
following ways.
1. Automatic reset. The integrated control module
will automatically reset itself and attempt to resume
normal operations following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to the
furnace.
3.
Manual thermostat cycle. Lower the thermostat so
that there is no longer a call for heat for 1 -20 seconds
then reset to previous setting.
note: I
f
tHe
conDItIon
wHIcH
orIgInallY
causeD
tHe
lockout
stIll
exIsts
,
tHe
control
wIll
return
to
lockout
. r
efer
to
tHe
t
roubleshootIng
c
hart
for
aID
In
DeterMInIng
tHe
cause
.
f
laMe
s
ensor
The flame sensor is a probe mounted to the burner/
manifold assembly which uses the principle of flame
rectification to determine the presence or absence of flame.
B
urner
f
laMe
f
Igure
65
TROUBLESHOOTING
e
lectrostatIc
D
IscHarge
(esD) P
recautIons
note: D
IscHarge
BoDY
’
s
statIc
electrIcItY
Before
toucHIng
unIt
. a
n
electrostatIc
DIscHarge
can
aDVerselY
affect
electrIcal
coMPonents
.
Use the following precautions during furnace installation
and servicing to protect the integrated control module
from damage. By putting the furnace, the control, and
the person at the same electrostatic potential, these steps
will help avoid exposing the integrated control module to
electrostatic discharge. This procedure is applicable to
both installed and uninstalled (ungrounded) furnaces.
1.
Disconnect all power to the furnace. Do not touch
the integrated control module or any wire connected
to the control prior to discharging your body’s
electrostatic charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the
furnace away from the control. Any tools held in a
person’s hand during grounding will be discharged.
3. Service integrated control module or connecting
wiring following the discharge process in step 2.
Use caution not to recharge your body with static
electricity; (i.e., do not move or shuffle your feet, do
not touch ungrounded objects, etc.). If you come
in contact with an ungrounded object, repeat step 2
before touching control or wires.
4.
Discharge your body to ground before removing a
new control from its container. Follow steps 1 through
3 if installing the control on a furnace. Return any old
or new controls to their containers before touching
any ungrounded object.
