Inspect your filter monthly and clean or replace when
needed.

A dirty filter will cause excessive stress on the furnace, heat exchanger, and blower motor and can cause it to overheat and automatically shut down. The furnace filter should be checked every 4 weeks and cleaned or replaced if necessary.

Clean or replace air filters.

Inspect cabinet for signs of damage.

A dirty filter will cause excessive stress on the furnace, heat exchanger, and blower motor and can cause it to overheat and automatically shut down. The furnace filter should be checked every 4 weeks and cleaned or replaced if necessary.

If installed with factory specified disposable media filter, check or replace filter before each heating and cooling season. Replace disposable media filter at least twice a year. If your furnace filter needs replacing, be sure to use the same size and type of filter that was originally specified. The air filter for the furnace may be located in a filter cabinet attached to the side or bottom of the furnace. If air filter has been installed in another location, contact your dealer for instructions. To inspect, clean and/or replace the air filter(s), follow these steps:

1. Turn off the electrical supply to the furnace.
2. Remove filter cabinet door (See Fig. 14 and 15.)
3. Slide air filter out of filter cabinet. Keep dirty side up (if dirty) to avoid spilling dirt.
4. Inspect the filter. If torn, replace it.

NOTE: If a washable filter has been replaced with:
A00227
A00228
Fig. 18 - Replace Side Filter Cabinet Door
Fig. 19 - Replace Bottom Filter Cabinet Door
A06192
A06193
a. Factory specified disposable media filter — Do not clean. If dirty, replace only with media filter having the same part number and size. Install with airflow direction arrow pointing towards blower.
b. Electronic Air Cleaner (EAC) — Refer to EAC Owner’s Manual for maintenance information.

5. Wash filter (if dirty) in sink, bathtub, or outside with a garden hose. Always use cold tap water. A mild liquid de- tergent may be used if necessary. Spray water through filter in the opposite direction of airflow. Allow filter to dry.
6. Reinstall clean air filter.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.

NOTE: If side return ducts are used, 2 filters may be required in some models. The procedure listed above may be used to remove side filters.

Filters may be field modified by cutting filter material and support rods (3) in filters. Alternate sizes and additional filters may be ordered from your dealer.

Inspect and clean door louvers if needed.

Inspect electrical disconnect for proper function. Repair or replace as necessary.

Inspect external wiring for damage.

Inspect and clean blower assembly (includes blower housing, blower wheel and motor).

Inspect airflow system (ductwork)—check for leaks and repair as needed.

Inspect evaporator coil, drain pan and condensate drain lines as applic- able. Clean as needed.

Have your furnace and vent system inspected annually by a
qualified service technician.

Inspect gas supply line and manual shut-off for leaks.

Inspect gas valve and check for proper manifold gas pressure Adjust as needed.

Inspect ignition system and safety controls. Clean and adjust as needed.

Inspect control box, associated controls, wiring and connections.
Check combustion blower housing for lint and debris and clean as ne- cessary.

Inspect burner assembly - clean as needed.

Inspect heat exchanger - clean as needed.

Inspect flue system—check for proper attachment to the furnace, any dislocated sections, and for signs of corrosion. Replace if necessary.