Drier stops after 15-20min. Beeps for a while. If turned off & on it restarts, goes for 15-20min again. have tested and bypassed door switch, heat sensor, exhaust sensor, etc. but still cuts out. Had pc board checked by electronic tech mate, but nothing obvious. Could it be the IC. I presume the drier must have a built in timer as well as moisture sensor. Are there fault codes available for this drier. Thanks, Ray