I received an error message stating the firing aborted because the kiln was failing to heat. Is it a faulty relay?

While “Failing to Heat” error can be caused by a failed relay, there are additional possible causes...

A “Failing to Heat” error can be caused by a failed relay, failed thermocouple, faulty wiring, or inadequate supply power. The best course of action is to contact your kiln manufacturer for further assistance in troubleshooting the cause of the alarm.