The setting is set to high for the blanket but the temp is nothing like
it used to be, more like the low setting temp. The temp is adjusted by
a rotating dial 1-9.
If I can get the control apart as there are no visible screws to
seperate so maybe a press fit, what should I look for (if it is
electronic I will bin them) as a possible cause?
How old is the blanket? Probably more likely that you have a dead element
circuit in the blanket itself. Of course I could be wrong but I think a
new blanket will be the simplest solution (if not the most satisfying from
a DIY POV).
I opened a faulty controller with multiple heat settings and 2 timer
settings. It had a PCB with microchips. I retired in good order (as I
never got my head around electronics, let alone microelectronics); but
in bad odour with the owner who thought I could fix stuff.
 evidence that the fault was in the controller - not the blanket:
swapping it with the controller from t'other side of the double blanket
swapped the side with the problem.
reply-to address is (intended to be) valid
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