House Furnace High limit switch

[Deadhead]

So its 10:45 pm and the wife realized the heat is not working in the house.

Pull the panel - depress the door switch and the control board is flashing a Thermal Protection Device Open code.

I start checking everything and get down to the high limit switch.
I did the paperclip jump and it fired up,
it run like it should with a good flame,
ran for a heat cycle shut down like it normally does.
Minutes later it cycled again fired up and did its normal thing and shut back off.

Basically its working like it should.
I fully understand that I could have a thermostat malfunction and it not shut off and do bad bad bad things to my unit or worse, my house.

My question is how long can I run it with the paperclip jumping it.

I can get a switch in the morning from my heat and air man but its going to be down in the single digits tonight and I need to keep the house somewhat warm.

 

[Rockhead261]

I wouldn't run it with a jumped safety unless I was sitting in front of it, and I used to fix them for a living.

I'd feel only slightly better if it's the limit and not the rollout switch.

Either way, replace it (are you sure it's not resettable?) and try to figure out why it popped in the first place. Open limit switches are symptoms, not problems.

Sent from my SCH-I545 using Tapatalk

 

[mygarageone]

It could just be a weak switch , that's not uncommon at all. But like op said not
Something to leave jumped out.

 

[d.swanson]

I'm no expert, but my Rheem started poping the over-temp/flame roll-out sensor - had a professional come check it out - holes in the heat exchanger (he showed me) danger of CO getting in the house. We're running a few portable space heaters until our unit gets replaced. BTW - our CO sensors in the house never went off.