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 Rick Your Own Question
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21992
Experience:  40+ yrs. experience as a licensed oil & gas technician.
Type Your HVAC Question Here...
Rick is online now
A new question is answered every 9 seconds

The red light at the bottom of our furnace keeps blinking

Customer Question

the red light at the bottom of our furnace keeps blinking and the furnace will not go on
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.

What is the flash sequence? how many short and how many long flashes before the pattern repeats?

Customer: replied 1 year ago.
1 short 1long 3 short
Expert:  Rick replied 1 year ago.

This is an open limit circuit error. First possibility and easiest to fix is a dirty filter. If you haven't changed your filter in a while then this would be the time to do it. Next possibility is an open rollout switch (see attached pic for typical). They are located just outside the burners. Try pushing the small button in the middle of the 2 wires. If it clicks you have reset it. Turn the power off first before you try this or do it while you replace the filter. Then turn the power back on. If it clicks the burner will fire up with any luck. If it doesn't click then it wasn't tripped. If none of that works check for bad connections along the entire length of the wire (both ends)that connects to the rollout.

Expert:  Rick replied 1 year ago.

If you still don't have any luck then you could have a bad limit which would take a multi meter to verify.
I have to step away for a half hour or so. I'll respond to any follow up questions when I return. If you don't have any more questions I'd appreciate a favorable rating