How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
23932409
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

I had an old mercury thermostat. I changed it out with a new

Customer Question

i had an old mercury thermostat. I changed it out with a new basic Honeywell thermostat. I labeled the wires from the old thermostat and wired the new one in. I did it through the winter and the furnace kicked on and off everytime no issues. when I went to turn on the ac nothing would kick on not even the fan running all the time. the outside unit will not start. where did I go wrong
JA: I'll do all I can to help. Is there anything else important you think the HVAC Technician should know?
Customer: the ac unit is less than 7 years old and worked perfectly last year no issues. the furnace is 40 plus years old
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 6 months ago.
Category: HVAC
Expert:  airheatman replied 6 months ago.

Give me model on both your indoor outdoor units and also thermostat.Then tell me what wires you have connected to what terminals on new(If you remember where they went on old)