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Hi Erik,
I had a similar issue a while back with my QHY9, but mine would either constantly show 100% and actually force the cooling to 100% (so regardless of my set point it would cool all the way down) or it would show my CCD sensor at something like 90C and force cooling to 100%.
I took my camera back to Theo a few times, different power sources and the TEC controller, eventually we had to replace the mainboard from memory. Never had an issue since, so maybe give Theo a shout? He's pretty good with fixing things up
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