As a sealed unit I suppose there is nothing other than banging the
compressor housing to reset the problem. Sometimes it will start properly so
not permanently seized. Control board fuse of 1.6 amp (240V supply) has
never blown but stall? current must be something more than 1 amp.
If the 'off' time is too short, the compressors will often not be able to
start into the back pressure that has not bled off yet. On my dehumidifiers
that seems to take about 5 minutes. If the compressor is capacitor start
[external capacitor] then I would also check that the cap is not worn out.
As you surmise, the motor current is not passing through that small fuse on
the control board. Even at 240V the compressor stall current will probably
be well over 5A since I am guessing that my 120V units are drawing 10-12A at
No capacitor seen.
2 wires to the compressor and under the cowling one wire goes to what I'd
have guessed to be a bimetal thermal cutout attached to the compressor body,
any markings obscured by metalwork. The other goes to one spade of a 3 spade
terminal , at first sight looks like a 25 amp triac. 2 spades unconnected
and ohmic between all 3, also connected to the main body.
Marked QP2-22 , this being the nearest to a datasheet that I've found
Norminal resistance : 22O±2%
Tripping time: 0.3?0.8S
Power dissipation: <=3.5W
I wonder what the other spades are for
I'll try monitoring this current a bit better than variac meter but it does
not seem to drop away within 1 second but 100 second reset time sounds like