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Fan limit switch on old furnace.

Tonylc4 Member Posts: 2
I have an old furnace, any one have an idea what type of fan switch I can replace this one with. Problem is the fan switch won’t come up unless I put in Manual then back to auto. 


  • mattmia2
    mattmia2 Member Posts: 7,148
    for starters look at the max temp on the ratings plate on the furnace and set the limit stop to that, then try moving the on stop up a bit and the off stop down a bit. if you have to replace it, you can get a combination fan/limit control from honeywell/resideo or white rodgers or robertshaw. you will need to pull it out and measure the probe length. The modern resideo control has a white knob for the manual control instead of that rocker. They are available from supplyhouse.com.
  • ch4man
    ch4man Member Posts: 287
    go to supply house (dot) com and search Honeywell fan limit control.
    pull your old one and match the insertion length.
    that's the best you'll be able to do
  • Tonylc4
    Tonylc4 Member Posts: 2
    Thank you! Ch4man