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Dave I appreciate your follow up.
I’ll replace stats and with a bit of good luck, the problem will resolve itself.Dave thanks again for coming back with your posting.
I can advise by linking the wires, in effect isolating the stats, the cooling fan runs.
The original test carried out on both front panel sensor stats to confirm working was undertaken by exposing them to heat by placing on a griddle for approx. 30 seconds in order to raise the temperature above 60 *C which is identified as the activation level. I’m unable to confirm the precise temperature, but naturally it would’ve had to have been in excess of this. Is it possible, the solution lie in replacing both stats, assuming the operating temperature has to be elevated well beyond the calibrated level before closing and powering up the cooling fan. Would this eliminate the circuit board being at fault?Thanks Dave for your prompt attention.
I’ve traced the wiring to the front panel knob sensor stats (2no. Linked) and rechecked for continuity. The thermostats are ‘open circuit’ and when exposed to heat respond by closing giving a resistance “0” ohms reading which suggests okay. The circuit board appears to be an integral part of the PROGRAMMER assembly. I am not sure how to check if this has failed other than to replace it. Can you offer any further thoughts or is it a question of “sucking it up” and purchasing a new one.
