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Failure to follow this caution could result in personal injury. COMBUSTION AREA AND VENT SYSTEM Inspect the combustion area and vent system before each heating season. An accumulation of dirt, soot, or rust can mean a loss of efficiency and improper performance. Buildups on the main burners can cause faulty firing. This “delayed ignition’’ is characterized by an alarmingly loud sound. If your furnace makes a loud noise when the main burners are ignited, shut down the fur- nace—call your servicing dealer. Use your flashlight and follow these steps for inspecting the combustion area and vent system of your furnace: 1. Turn off the electrical supply to the furnace and remove the access door. (See Fig. 7 and 8.) 2. Carefully inspect the gas burner (see Fig. 17) for dirt, rust, or scale. Then inspect the elbow, flue connection area, and the vent pipe for rust. 17 NOTE: If dirt, rust, soot, or scale accumulations are found, call your servicing dealer. DO NOT OPERATE THE FURNACE. 3. Inspect the vent pipe for a sag, holes, or a disconnection. A horizontal vent pipe must slope upward away from furnace. If rusty joints or seams, or signs of water leakages are found call your dealer for service. WARNING! If holes are found—or if the vent pipe is obstructed or is not connected—toxic fumes can escape into your home. DO NOT OPERATE YOUR FURNACE. Call your dealer for service. A failure to follow this warning could result in personal injury or death. 4. Replace the access door and restore electrical power to the furnace. (See Fig. 12.) 5. Start the furnace and observe its operation. If possible, watch the burner flames. Are they burning bright blue? If not (or if you suspect some other malfunction), call your servicing dealer. 6 21 22 23 BEFORE YOU REQUEST A “SERVICE CALL” BEFORE YOU CALL FOR SERVICE, CHECK FOR SEVERAL EASILY SOLVED PROBLEMS: • Check for sufficient airflow. Check the air filter for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. If this isn’t the cause, call your servicing dealer. If your furnace isn’t operating at all, check the following list for easily solved problems: • Is your thermostat set above room temperature? Is the HEAT mode selected? • Is the electrical power supply switch ON? Is the blower access door firmly in place? Are any fuses blown? (There is a fuse on the furnace control board.) Has a circuit breaker tripped? • Is the manual shutoff valve in the gas supply pipe leading to the furnace open? Does the lever point in the same direction that the pipe runs (open)? Or is it at right angles (closed)? NOTE: Before proceeding with the next checks, turn OFF the electrical power supply to the furnace. Remove the access door. • Is the switch on the gas valve turned to the ON position? If this or the preceding check shows an interruption in the gas supply, make sure the gas has not been shut off for safety reasons. If nothing else seems to be wrong, follow the startup procedures found on pages 4 and 5 of this booklet. • If for some reason the vent is blocked, the blocked vent safeguard switch will shut off the furnace. (See page 2 for switch location.) The switch will automatically reset after the furnace cools off. • Check the manual-reset limit switches located near the burners. If the furnace has experienced a high-temperature condition, due to inadequate combustion air, these switches will shut off the furnace. Reset the switches by pushing the button on the switch. If the switch trips a second time, turn off the furnace and call for service. • If your furnace still fails to operate, call your servicing dealer for troubleshooting and repairs. Tell your dealer the model and serial numbers for your furnace. (You should have them recorded on page 8 of this booklet.) By knowing exactly which furnace you have, the dealer may be able to offer suggestions over the phone, or save valuable time through knowledgeable preparation for the service call. REGULAR DEALER MAINTENANCE In addition to the type of routine maintenance you might be willing to do, your furnace should be inspected regularly by a properly trained service technician. An annual inspection (or biennial inspection, at least) should include the following: 1. Inspection of all flue gas passages— including the burners, heat exchanger, inducer, elbow, and vent pipe. 2. Inspection of all combustion and ventilation air passages and openings. 3. Close check of all gas pipes leading to (and inside of) your furnace. 4. Inspection and cleaning of the blower motor and wheel. 5. Routine inspection and cleaning/ replacement of the air filter. 6. Inspection of all supply- and return-air ducts for obstructions, air leaks, and insulation. Any problems found should be resolved at this time. 7. Inspection of furnace installation for proper support and any obvious deterioration of the furnace. The support must be sound and without sags, gaps, cracks, etc., around the furnace base so as to provide an air seal be...

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