Regular Dealer Maintenance

!WARNING

If holes are found or if the vent pipe is obstructed or is not connected, toxic fumes can es- cape 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 doors and restore electrical supply to the furnace. Be sure bottom door ﬂange is inside of the furnace cas- ing. (See Fig. 16 and 17.)

5.Start the furnace and observe its operation. If possible, watch the burner ﬂames. Are they burning bright blue? If not or if you sus- pect some other malfunction, call your servicing dealer.

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 of the problem, 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 switch in the HEAT position?

•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.) Has a cir- cuit 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 a right angle to the pipe (closed)?

NOTE: Before proceeding with the next checks, turn off the electrical power supply to the furnace. Remove access doors.

•Is the control knob or 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 draft safeguard switch will shut off the furnace. Reset the switch by pushing the button located on top of the switch. See page 2 or 3 for switch location.

If the switch trips a second time, turn off the furnace and call for service.

•DOWNFLOW HORIZONTAL ONLY—Check the manual reset auxil- iary limit switch located on the blower housing. If the blower motor fails, this switch will shut off the furnace. Reset it by pushing the button on the switch. If it trips again, turn off the furnace and call for service.

•Check the manual reset ﬂame roll- out switch(es) located near the burn- ers. If the furnace has experienced a high-temperature condition due to inadequate combustion air, these switches will shut off the furnace. Reset the switch(es) 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 trouble- shooting and repairs. Tell your dealer the model and serial numbers for your furnace. (You should have them recorded on page 12 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.

•Your furnace control board has an LED fault code light that indicates the furnace status. The LED will ﬂash short and long ﬂashes. Look through the sight glass on the furnace door and determine the code (number

of short and long ﬂashes). Give the code and furnace model number to your dealer when you call. By knowing exactly which furnace you have and the LED code being displayed, your dealer can save valuable time through knowledgeable preparation for the ser- vice call.

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. A semiannual inspection (or annual inspection, at least) should include the following:

1.Inspection of all ﬂue product passages including the burners, heat exchanger, relief box, and vent pipe.

2.Inspection of all combustion and ventilation air passages and openings.

3.Close check of all gas pipes lead- ing to and inside of your furnace.

4.Inspection, cleaning, and lubrica- tion (when required) of the blower motor and wheel.

NOTE: Refer to the unit Service Procedures for blower motor oiling information. When required, the motor must be oiled by a qualiﬁed service technician.

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.Inspect the return-air duct con- nection(s) at the furnace to ensure it is physically sound, sealed to the furnace casing, and terminates outside the space con- taining the furnace.

8.Inspection of furnace installation for proper support and any ob- vious deterioration of the furnace. The support must be sound and