John wrote:
I thought door locks tended to be mechanical - locked by a bimetal device
with a heating element. Could that heater get too hot if in the proximity
of a tub of hot water?

TV news had a shot of the door lock mechanism (square hole for the door
latch to go through), showing a couple of wires going into it and burning of
the plastic next to one.

Suggested workaround is to wash at 20C, suggesting the heater element isn't
in circuit.

Perhaps they're putting the door lock in series with the heating element?

Looking at the interlocks on ebay, most of them have connectors rather than
wire-terminals. This is from one of the affected models:
http://siteassets.ransomspares.co.uk...6242617757.jpg

Googling for schematics (not that many are public) does suggest it's common
to put the door/lid switch in series with everything else, so the machine is
cut off when the door is open. Which would mean the door switch takes
substantial load on warm washes.

Theo