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The electrical ground and polarity for 115- -v wiring must be
properly maintained. Refer to Fig. 24 for field wiring information
and to Fig. 38 for furnace wiring information.
NOTE: If the polarity is not correct, the STATUS LED on the
control will flash
10
and prevent the furnace from heating. The
control system also requires an earth ground for proper operation
of the control and flame- -sensing electrode.
The 24- -v circuit contains an automotive- -type, 3- -amp. fuse
located on the control. (See Fig. 38) Any shorts of the 24- -v
wiring during installation, service, or maintenance will cause this
fuse to blow. If fuse replacement is required, use ONLY a 3- -amp.
fuse. The control LED will
replaced.
Proper instrumentation is required to service electrical controls.
The control in this furnace is equipped with a Status Code LED
(Light- -Emitting Diode) to aid in installation, servicing, and
troubleshooting. The furnace control LED is either
or displaying a code composed of 2 digits. The first digit is the
number of short flashes, the second digit is the number of long
flashes.
For an explanation of status codes, refer to service label located
on blower access door or Fig. 35 and the Service guide at the end
of this manual.
CARE AND MAINTENANCE
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never store anything on, near, or in contact with the
furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids,
or other volatile fluids.
3. Paint thinners and other painting compounds, paper
bags, or other paper products.
30
be OFF
when fuse needs to be
Heartbeat, 10
Fig. 35 - - Service Label
Specifications are subject to change without notice.
See Fig. 35 for a summary of fault codes and a brief explanation
of fault codes.
The stored status code will not be erased from the control
memory, if 115- - or 24- -v power is interrupted.
1. To retrieve status code, proceed with the following:
NOTE: NO thermostat signal may be present at control, and all
blower- -OFF delays must be completed.
a. Remove outer access door.
b. Remove inner blower door.
c. Close blower door interlock switch.
d. Using a length of wire, briefly short the TEST/TWIN
terminal to the C terminal on the furnace control.
2. When above items have been completed, the LED flashes
the fault code history (up to 5 fault codes from newest to
oldest). Record the status code(s) for further troubleshoot-
ing.
3. Check LED status. If no previous faults in the history,
control will flash heartbeat.
4. Component self- -test will begin. Refer to Component Test
section of service label for complete test sequence.
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on
this equipment. Consult your local dealer about proper frequency
of maintenance and the availability of a maintenance contract.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Turn off the gas and electrical supplies to the unit and
install lockout tag before performing any maintenance
or service. Follow the operating instructions on the label
attached to the furnace.
A190413
441 01 1501 04
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