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I have an issue with the bed heater. I was printing PETG and it may have being to hot. The bed temp was set at 85. The nozzle was set at 255. The bed heater will not activate and the alarm goes off and shuts the machine down. It all was working fine up to this point. I’ve unplugged power and restart, but still the alarm goes off and shuts down. Any help would be appreciated.