SF1000 Operator Manual | 8.2018


Problem: Draft blower runs constantly.


Possible Causes:

• This can be checked by turning the thermostat to a lower setting than the temperature in your home. If the draft blower continues to run, the thermostat may be defective. Replace if necessary. • Replace transformer and relay. • Have a professional determine the proper size furnace and insulation factor of your home.

• Defective wall thermostat.

• Defective relay in transformer.

• Home is not being supplied with a sufficient amount of heat to satisfy the wall thermostat.


Problem: Rapid accumulation of creosote in furnace and flue.

• Use of high resin wood, such as pine. Possible Causes:


• Completely avoid using if at all possible. If hardwoods are not available, fuel the furnace with smaller loads. This will cause the thermostat to call for more heat more often, which will initiate the running of the draft blower. Consequently, the fires will be hotter, thereby reducing the accumulation of creosote. • Install flue gas thermometer and maintain stack temperatures between 300° and 400° F. • See #9. • DANGER: Never use uninsulated stove pipe as chimney. It must not be used on the inside of your home due to high stack temperatures, which create an extreme fire hazard. Uninsulated pipe cannot be used as an outside flue because it causes rapid cooling of the stack gases, which causes them to condense as creosote on the inside of the flue. • Inspect entire flue run, from the exhaust stack of the furnace to the termination cap. Repair as necessary. • Furnace room may be too airtight to supply sufficient amount of oxygen for combustion. Install an aperture to the outside consisting of a minimum of 12 square inches or 4 inches round. • Install stainless steel liner in masonry chimney to reduce creosote formation and improve draw. Use appropriate size stainless liner for the furnace.

• Under-firing the furnace has

caused low flue gas temperature.

• Insufficient chimney draft.

• Using uninsulated stove pipe for the chimney, especially if the construction is on the exterior of the home.

• Improper connection in stove pipe causing air leakage or a structural defect in the chimney itself. • Fire box not receiving adequate amount of oxygen.

• Use of an unlined masonry chimney with a large clay tile opening.


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