I have a Heil gas furnace as back up/ heat pump. When the temp gets below 40 degrees the furnace kicks in as set, but runs a short cycle, burners kick off and power to the thermostat is cut off but the fan finished the cycle.Then resets it self for a short cycle again. This process has gotten worse over the years.and does not keep up temp. Techs have checked it out 3 times each replacing thermostat which didn't fix problem. Any suggestions to what is causing this issue

  • Could be bad high limit, or that the furnace is actually overheating. Is the blower running at the correct speed? Is the filter clean? Do you have good air flow through the furnace? – Tester101 May 8 '17 at 18:12

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