Furnace flame rollout safety


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This is a picture of a flame rollout safety switch it will trip at a set temperature. The temperature set point of the rollout is designed to open when the flame is coming out the front of the burners

  • Possible heat exchanger has a hole or big crack.
  • Another possible cause is a combustion air intake pipe getting a plugged screen, Which will cause the room to work in A negative air pressure. Then air will be pulled in through the exhaust vent pushing flames out of heat exchanger and tripping the switch.

Between the wires the switch has a resettable button, but the cause of the problem should be found before leaving furnace. Never jump safety switch as it could cause property damage.

Click here to see my post on protecting your home “Alarm for Home”

Thank you for visiting my blog I would appreciate any feedback I can get, Please leave a comment on whether my information has helped you. I am always interested in more topic to write so feel free to leave a comment asking about anything related to HVAC-R (Heating, Ventilation, air conditioning, refrigeration).

Thanks for reading my blog

4 thoughts on “Furnace flame rollout safety

  1. inommattVox 12/16/2012 at 10:34 pm Reply

    This really answered my challenge, thank you!

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    • jetstrem 12/18/2012 at 8:50 am Reply

      Anytime a rollout is reset make sure the reason for the rollout is addressed or it will keep giving you problems. It is good I was able to help you through this challenge.

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