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Troubleshooting a Gas Furnace - Furnace Repair

By Bob Formisano, About.com

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PROBLEM: Gas Furnace Comes On and Off Too Frequently


Gas Furnace Comes On and Off Too Frequently

Possible Causes

  • Dirty furnace air filter
  • Blower motor problem
  • Thermostat problem (heat anticipator)

    Possible Repairs

  • Adjust thermostat heat anticipator
  • See also Troubleshooting a Thermostat
  • Replace dirty air filter
  • Oil blower motor lubrication ports (usually at each end of shaft) with light weight oil
  • Check for proper belt tension. Belt should depress about 1" at center of span.
  • If too loose, tighten belt.
  • Replace frayed belt.

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