51
MAINTENANCE
Troubleshooting
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
PERFORMING
ANY
SERVICE
OR
MAINTENANCE
.
WARNING
Refer to the
Troubleshooting Codes
for assistance in determin-
ing the source of unit operational problems. The dual 7-seg-
ment LED display 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 ig-
nition after three attempts during a single call for heat. It is
characterized by a non-functioning furnace and a
E 0
code dis-
played on the dual 7-segment display. If the furnace is in “lock-
out”, it will (or can be) reset in any of the following ways.
1. Automatic reset. The integrated control module will auto-
matically reset itself and attempt to resume normal opera-
tions 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:
If the condition which originally caused the lockout still
exists, the control will return to lockout. Refer to the
Troubleshooting Codes
for aid in determining the cause.
Maintenance
T
O
AVOID
ELECTRICAL
SHOCK
,
INJURY
OR
DEATH
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
PERFORMING
ANY
MAINTENANCE
. I
F
YOU
MUST
HANDLE
THE
IGNITER
,
HANDLE
WITH
CARE
. T
OUCHING
THE
IGNITER
ELEMENT
WITH
BARE
FINGERS
,
ROUGH
HANDLING
OR
VIBRATION
COULD
DAMAGE
THE
IGNITER
RESULTING
IN
PREMATURE
FAILURE
. O
NLY
A
QUALIFIED
SERVICER
SHOULD
EVER
HANDLE
THE
IGNITER
.
WARNING
A
NNUAL
I
NSPECTION
The furnace should be inspected by a qualified installer, or ser-
vice agency at least once per year. This check should be per-
formed at the beginning of the heating season. This will ensure
that all furnace components are in proper working order and
that the heating system functions appropriately. Pay particular
attention to the following items. Repair or service as neces-
sary.
•
Flue pipe system. Check for blockage and/or leakage.
Check the outside termination and the connections at
and internal to the furnace.
•
Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
•
Burners. Check for proper ignition and burner flame.
•
Drainage system. Check for blockage and/or leakage.
Check hose connections at and internal to furnace.
•
Wiring. Check electrical connections for tightness and/
or corrosion. Check wires for damage.
•
Filters.
F
ILTERS
T
O
ENSURE
PROPER
UNIT
PERFORMANCE
,
ADHERE
TO
THE
FILTER
SIZES
GIVEN
IN
THE
RECOMMENDED
M
INIMUM
F
ILTER
S
IZE
T
ABLE
OR
S
PECIFICATION
S
HEET
APPLICABLE
TO
YOUR
MODEL
.
CAUTION
F
ILTER
M
AINTENANCE
Improper filter maintenance is the most common cause of in-
adequate heating or cooling performance. Filters should be
cleaned (permanent) or replaced (disposable) every two months
or as required.
B
URNERS
Visually inspect the burner flames periodically during the heat-
ing season. Turn on the furnace at the thermostat and allow
several minutes for flames to stabilize, since any dislodged dust
will alter the flames normal appearance. Flames should be stable,
quiet, soft, and blue (dust may cause orange tips but they must
not be yellow). They should extend directly outward from the
burners without curling, floating, or lifting off. Flames must
not impinge on the sides of the heat exchanger firing tubes.
I
NDUCED
D
RAFT
AND
C
IRCULATOR
B
LOWERS
The bearings in the induced draft blower and circulator blower
motors are permanently lubricated by the manufacturer. No fur-
ther lubrication is required. Check openings on motor hous-
ing for accumulation of dust which may cause overheating. Clean
as necessary.
C
ONDENSATE
T
RAP
AND
D
RAIN
S
YSTEM
(Q
UALIFIED
S
ERVICER
O
NLY
)
Annually inspect the drain tubes, drain trap, and field-supplied
drain line for proper condensate drainage. Check drain system
for hose connection tightness, blockage, and leaks. Clean or
repair as necessary.
F
LAME
S
ENSOR
(Q
UALIFIED
S
ERVICER
O
NLY
)
Under some conditions, the fuel or air supply can create a nearly
invisible coating on the flame sensor. This coating acts as an
insulator causing a drop in the flame sense signal. If the flame
sense signal drops too low the furnace will not sense flame and
will lock out. The flame sensor should be carefully cleaned by a
qualified servicer using steel wool.
