I've had my bed continually heat up and not stop. I have replaced the SSR and replaced it with an identical-looking one and also replaced it with a MOSFET.
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1Hi, and welcome to 3DP. Please take the [tour](https://3dprinting.stackexchange.com/tour) and consider how you might [improve your question](https://3dprinting.stackexchange.com/help/how-to-ask). Please list details about your make and model of printer this is, what flavor and version of firmware you're using, and any other information that can help us give you a helpful answer. – Davo Nov 13 '20 at 17:31
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Does it report accurate temps? Sounds like the temp sensor is out. – dandavis Nov 13 '20 at 20:47
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In that case [TRP](https://3dprinting.stackexchange.com/questions/8466/what-is-thermal-runaway-protection) is not active, else it wouldn't keep heating, and firmware should be updated before even continuing. – 0scar Nov 16 '20 at 23:31