What is this?

[capwizard]

What is this?.................

[srhofmann]

Re: What is this?

Thermal limit switch, probably in a furnace.

[capwizard]

Re: What is this?

That's fast, Yes, re-settable Thermal limit, Roll Out switch, I've spent an hour to research!
One more question, how is the temperature rating? Thank you.

PS: Its not for fun, I really need one, I've it broken.

[budm]

Re: What is this?

Can you still read the print on the body? or if you have the wiring diagram of the furnace, it should be on the cover some where?

[capwizard]

Re: What is this?

This was a service call, I took some picture and leave, and forgot about print on the body. now I can only use the color code to find out, otherwise I need to go black again. Thank you.

[srhofmann]

Re: What is this?

Got the make model and serial number of the furnace? Your local parts house should be able to get it with that info.

[budm]

Re: What is this?

They are normally closed switches and goe open when over safety temperature occurs so it will kill the power to the Gas valve.
So, yes, the make and model will help.

[capwizard]

Re: What is this?

Thank you very much, "Got the make model and serial number of the furnace?" This is a central air conditioner unit, I cant find the model no. From outside case of furnace, cant see any brand name on it, I too shame to ask for original manual.

This is what I found it.

Amazon: Carrier Bryant Payne HH18HA452 Roll Out Switch 250 Degree Temperature Rollout Switch with Manual Reset.

Ebay: Furnace L290F Limit Switch 1NT08L, HH18HA490A, 9731V 290°....................this one..same color.....

PS: Goodman/Janitrol Furnace:
https://janitrolrepairparts.com/gas-valves/

[srhofmann]

Re: What is this?

There should be a stamped metal plate with all the info on it. It's usually located near the burners or the control board. You can't just guess at which switch to put in and just because they look the same doesn't mean that they are.

If it's an air conditioner/water chiller/heat pump there should be a label on the outside of the unit.

[capwizard]

Re: What is this?

Ok, I will go back ask for original user manual if they still have it or take more clear pictures, because cooling unit is inside the 2nd floors ceiling.

PS: this is not the original problem, which is after I took out 2 thermostatics, furnaces fan till random on and off, my next step is to clean this (Goodman Janitrol Amana B13709-08 limit switch 7" L160F-30 B13709-08).....

[budm]

Re: What is this?

https://www.badcaps.net/forum/attach...5&d=1483550281

What are printed on that white 8.5 x11 paper?

[capwizard]

Re: What is this?

Instructions, How to turn on and off the gas pilot light.

PS: The switch broke but inside circuit still in shorted condition so furnace is working......probably (silicone)s it back......original is the best................you know.....I did not touch that switch......

[capwizard]

Re: What is this?

Thanks to srhofmann:
There should be a stamped metal plate with all the info on it. It's usually located near the burners or the control board. You can't just guess at which switch to put in and just because they look the same doesn't mean that they are.
If it's an air conditioner/water chiller/heat pump there should be a label on the outside of the unit.

This is what I found it, which is wrong one
Amazon: Carrier Bryant Payne HH18HA452 Roll Out Switch 250 Degree Temperature Rollout Switch with Manual Reset.
Ebay: Furnace L290F Limit Switch 1NT08L, HH18HA490A, 9731V 290°....................this one..same color.....

Found the model NO.
GMP075-4
https://cdn.badcaps-static.com/pdfs/...e2ee1acf8b.pdf


Is this the right one? B1370154 350 F

Goodman Amana B1370154 Flame Rollout Switch 350° OEM - NEW **Free Shipping**
http://www.ebay.com/itm/Goodman-Aman...igHyVKD116BzMA

[sam_sam_sam]

Re: What is this?

Is the thermostat calling for heat all the time if
YES then check these items

Dose the fan stay ON all your the time when you put the fan switch to
(Run or ON-not on AUTO) if dose stay ON all the time then you ether have a bad fan switch on the thermostat or a bad fan relay

Or you could have a bad fan motor run cap or a ( bad fan motor winding ) on low speed this does not happen very often but I have seen it before to see if this is the case change to a higher fan speed and see if it dose the same thing or not

If NO

Then check the furnace to see why it is not calling for heat

[capwizard]

Re: What is this?

Thank you for your advice I really appreciate it.

[srhofmann]

Re: What is this?

B1370154 350 F looks like the right part number to me. Just as a double check make sure that it is in series with the other roll out switches. Wouldn't want to put a roll out switch (350F) in instead of a primary limit switch ( approx 200F).

Let us know how things go.....

P.S. Thanks for the link to the manual.