I burrowed into an older working dehumidifier I could wreck if I needed.
This is aWDH -101B with a P330MC PTC start themistor .
There is a schematic for this in use in an LG NS30LAEG out there so I could
see how the run/start circuit works.
Unfortunately need to cut a corner off that PTC (not 3 exposed terminals , 2
others are sockets underneath for pins from the 2 coils) to expose the other
terminal for the other side of the disc thermistor that connects to the run
coil.
Not enough discrimination in voltage drop to use a neon across the PTC. But
a 240V neon from this exposed contact and the commoned feed to both coils at
least shows when the cut out is activated as 240V across then. 4V
(centrifugal switch ? so presumably induced voltage) across in normal
running of the motor and 58V across in stall so the added indicator neon is
out in those situations. At least then an owner knows that despite the fan
noise , the pump is not running as this neon would continuously cycle 3
minutes on , 5 seconds off, ...
Now to add a neon to the GET machine