7.
Problem: Draft blower runs constantly.
Remedies:
Possible Causes:
• Defective wall thermostat.
• 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 relay in transformer.
• Home is not being supplied with a sufficient amount of heat to satisfy the wall thermostat.
8.
Problem: Rapid accumulation of creosote in furnace and flue. Possible Causes: Remedies: • Under-firing the furnace has caused low flue gas temperature.
• 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.
• 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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