Still no luck? It may be a thermostat wiring connection problem, wiring damaged by a grass trimmer near the outdoor unit, or the thermostat may have simply gone bad and needs replacement. These possibilities need to be checked by a technician, and further evaluation by a licensed HVAC contractor is the next step.

    Oops, almost forgot! There is one more possible solution if you have a combination gas furnace and electric air conditioner, and have recently replaced the air filter. Did you have to remove the bottom panel of your furnace/air handler to change the filter behind it? There is a safety switch along the top of the panel opening that shuts off both the system and the digital thermostat when the panel has been removed or is loose. Check to make sure that the panel is securely back in place so that the switch is not activated.  The switch can be a lever-type, like the one shown below, or a pop-out button.

While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector. Also, construction standards vary in different parts of the country and it is possible that important issues related to your area may not be covered here.
© McGarry and Madsen Inspection


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We want you to be an informed homebuyer, and each blog post is a question that we have answered for our friends and customers over the years. Hope they help you make a good choice for your next home.

More blog posts about heating and air conditioning:

  1. How can I find out the size of my air conditioner?

  2. How can I find out the age of my air conditioner or furnace?

  3. Does a half bathroom (no shower or bathtub) require an exhaust fan?

  4. Is a kitchen required to have a range hood exhaust fan?

  5. The coils on my heat pump are covered with ice on cold mornings. What’s wrong with it?

  6. What is the SEER of my old air conditioner?

  7. What is the difference between the “ON” and “AUTO” settings on my thermostat?

  8. What is a “ton” of air conditioning?

  9. How do I find the right size air conditioner for my house?

  10. What is an HVAC system?

  11. What is the difference between the SEER and EER of an air conditioner?

  12. What does an ultraviolet air treatment system do?

  13. The coolant line to the outside unit of my air conditioner is frozen. What's wrong?

  14. What size air conditioner is right for my mobile home?

  15. What is the minimum SEER rating for a new air conditioner?

  16. What does the “AFUE” rating of a furnace mean?

  17. How much life is left in that air conditioner?

  18. Why is there mold around the air conditioning ducts?

  19. What is a geothermal heat pump?

  20. What is the difference between a heat pump and a cooling air conditioner?

  21. Is it alright to close the air conditioning vents in unused rooms?

  22. What is the right MERV number for my air conditioning filter?

  23. Should I move my air conditioner into the attic?

  24. What is an air conditioning heat recovery system?

  25. What is the average lifespan of an air conditioner?

  26. Should I remove an old whole house fan or keep it?

  27. Will closing doors reduce my heating and cooling costs?

  28. Why is my bathroom vent fan not exhausting enough air?

  29. Why can’t I use my home’s central air conditioning system to cool the garage?