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I have an S1 V2 (really a Lucca A53) that has been working flawlessly for 4+ years and recently started eating up grouphead temperature probes. I had one fail (20-21 lights lit up) about 6 months ago, replaced it, and it worked fine until last week. Same error, replaced with another new temperature probe, which worked for 1 day and then failed - or at least is coming up with the same error again.

I'm open to any suggestions on potential troubleshooting as a next step.

Thanks!

This fault can have three different potential causes: 1) Temperature >145C when initially turned on. Probe or circuit shorted. 2) Temperature <60C (Probe or Circuit Open.) 3. Temperature does not exceed 60C within 5 minutes.

Error 1 is most likely the probe though it could also be the result of a short between the 2 wires.
Error 2 could be the probe or a loose wire between the probe and the controller board.
Error 3 is probably a faulty boiler heat element. This error would take 5 minutes to happen after the boiler turns on. The first two would probably happen immediately.