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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a bad limit switch and I bypassed it, since it's

Customer Question

I have a bad limit switch and I bypassed it, since it's extremely cold.
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: It failed last night when we were not here. Showed up this morning and tested the limit sensors. This one seems to be bad.
JA: Do you plan on doing the work yourself?
Customer: Yes.
JA: Anything else we should know to help you best?
Customer: How to confirm the sensor is bad
Submitted: 5 months ago.
Category: HVAC
Expert:  Rick replied 5 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.

If the unit didn't run until you jumped out a limit then that limit is bad. You can't run the unit with any limit jumped out. It's a primary safety device. If you have to run the heat to keep the pipes from freezing then you can't leave the furnace unattended.

Customer: replied 5 months ago.
That is what I am doing. This is a 3" sensor with a button. It now has continuity. How can I be sure the sensor is bad?
Expert:  Rick replied 5 months ago.

I just said if you jumped it out and the unit works then it's bad. There's a glitch with your account. If you want to talk then contact customer service to iron it out. Or we can continue here

Expert:  Rick replied 5 months ago.

Do you have more questions?

Expert:  Rick replied 5 months ago.

Did you try pushing the button on the "sensor"?

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