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Hot Topics: Repair of oven switches



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Original post: Carrier 50M56U-751 High Temp Limit switch

the_dude Thread Starter

I have a single-stage carrier that I replaced the scorecard with last year because I would not postpone. It worked well until now. The error is giving is code 4 high temperature limit switch. It tries to shoot and the lighter lights but then turns off. My question is that I understand that the high temperature limit switch is a fan limiting switch but is it an integral part of the control board of this unit? In that case, I have to replace the whole control board again.

Thanks guys!

the_dude ̵

1; Thread Starter

Also the fan is stuck and will not stop running.

roughneck77 Member

It is a separate section.

Is the burner fired or does it not pass ignition attempts?

the_dude Thread Starter

The lighter heats up and then shuts off – the burners are fired for a few seconds and then shut off.

roughneck77

Sounds like the border is firmly open. You can test it with your meter.

the_dude Thread Starter

Ok will do. I can imagine that they cost less than the scorecard. I might just replace it anyway (if it gets stuck it would surely hold on again if I managed to make it work).

the_dude Thread Starter

How can I tell which is the limit switch? From the pictures I have seen on the net, a roll-out switch looks very similar to a limit switch.

roughneck77 Member

The limit is in the outlet flow above the heat exchanger.

The furnace is not meant to cycle on the border so I am sure you will find the cause after taking care of the boundary issue.

the_dude – Thread Starter

Thanks, rough neck. Do you mean I find the reason for what made the border contact open? I had exactly the same problem last year and a guy who tested it told me it was the board and that the limit switch was good. I replaced the board at that point and it worked fine for ten months but it did it again. is it possible for the limit switch to burn out my board?

roughneck77 Member

No, it is possible that there is a reason the border tripped or tripped. They are intended to travel in an unsafe condition, not under normal operating conditions.

the_dude Thread Starter

Got it. I'll figure out the limit switch and see what comes up next.


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