Another easy job to do and these do go know and again even though they are usually high quality , best to replace with originals as they handles a fair amount of current so cheaper one could be a fire hazard.
Use you Multimeter on continuity with buzzer attach leads and listen for the buzzer.
to replace them you need to undo the wiring for the heater elements so be careful as to remember the correct order of fitment.
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before you take the front cover off set switch to stop position and note orientation of the switch
its just threes screw to take the cover off and on off switch mechanism
Pull indicator light out of the way
undo all 3 screws
You will then gain access to the micro switches
pull the top one of its mounting pegs and test for continuity
if the multimeter beeps you know it working
as you can see very low resistance so a good switch
repeat of the lower micro switch
and lastly the solenoid micro switch at the very bottom
you can actuate it via the switch hole as per photo
close up of switch and multimeter connections for very bottom microswitch
See our 2 videos on how to test the microswitches and the selector controls below
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