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Do you have 2 separate heating units and two separate thermostats?
am going to have to leave shortly so I am opening this to other experts.I have opted out of the question to see if perhaps other experts may have more information and can assist.Please do not rate or reply as that will send question back to my desk.Please stand by to see if another expert can assist further.
I see know one has assisted you.Do you still need help with this?
OK lets start at the beginning.Most heating and air conditioning questions require some diagnosing of the specific situation.Very few are one line asnwers .To be professional and provide you with an accurate answer may require me gathering some details such as model number on units and specifics on the issue at hand.To tell you to replace a part or exactly what is wrong with your unit without knowing this information would not be doing you justice ,would be less than professional on my end and a guess at most.Please provide information I ask for so that I can provide accurate answers to your specific equipment and situation.
Let me first get model on the furnace or air handler that is not working and then model on thermostat.Tell me exactly what is displayed on thermostat if digital and what if anything happens when you call for heat.