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, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

My trance unit on the circuit panel is flashing that there

Customer Question

My trance unit on the circuit panel is flashing that there is a pressure switch problem. Is there anyway to reset it
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

You can turn the power off to the furnace, wait a minute then turn it back on. If that doesn't reset it then you have a draft issue. The question is do you have a bad switch or a weak fan or a blocked exhaust vent. You can check the vent for blockages and also the vac tubing connected to the switch. Be sure the tubing is not kinked, deteriorated or doesn't have water in it. You can also poke a paper clip into the port where the tubing connects but not into the switch connection. If all of that checks out the next thing we would do is put a manometer on the exhaust to check the actual draft pressure but you aren't likely to have a manometer and they are expensive so replacing the switch is one other option since it's less money than a manometer (or a new draft fan) and it is a likely culprit.

Customer: replied 1 year ago.
It's a Trane xl 1200 it's is still blinking. Where would the switch be located and where would the exhaust vent be located
Expert:  Rick replied 1 year ago.

You didn't specify the model before. I don't have access to specs for this unit. I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.

Expert:  Brian HVAC Guy replied 1 year ago.

Hi Troy, I'm Brian and I'm here to help!

With the XL1200 model number, it sounds like you may have a heat pump. Is the flashing led on the indoor or outdoor unit? Is your indoor unit an air handler with electric backup heat or is it a gas furnace?


Customer: replied 1 year ago.
I got it going guess I didn't have it turned off long enough for it to reset
Expert:  Brian HVAC Guy replied 1 year ago.

That's good news! I'll turn your question over to CS then. Thanks for using Just Answer!

Best regards,