"Pat Coghlan" wrote in message
...
It turns out there's a breaker/reset on the motor (mounted beside one of
the capacitors) which must have popped. My 7 year-old twin looked it over
and found it (well, I helped by turning it on its back in our living
room). There's no reference to it in the manual.

BTW, there's some kind of spring plunger on the side of the pressure
switch housing. I can't figure out what it does. If anything, it would
push *down* on the plate that rises to open the contacts (i.e. prevent it
from rising...but I don't see why anything would want to prevent contacts
from opening).

Telstra wrote:
The three adjustments are :
Auto / OFF switch which should be set to Auto
Setpoint which sets the Cut IN value
Range which sets the differential and Cut out value
Factory set Cut in 50psi Diff 30psi Cut out 80 psi

"Pat Coghlan" wrote in message
...
My slightly out-of-warranty (by 1 month) CH twin tank compressor won't
switch on any more. I've hardly used the thing.

It has a LEFOO LF10-4H pressure switch which I suspect is the problem.
I need to borrow a meter to check voltages at the contacts as a first
step.

That said, is there some part that could have jammed that I could free
somehow? There is a brass spring plunger on the side of the thing with
a Torx adjustment screw (it touches the same plate that moves the
contacts) whose function I don't really understand. I imagine there is
also an assembly under the module that "pops up" to break the contacts
when cut-out pressure is reached. This can be adjusted by two screws -
one for both cut-in/cut-out pressure and one for cut-in only. I haven't
changed these settings.

The damn switch costs more than half what I paid for the compressor!

Any info on what adjustments/checks I can do myself would be
appreciated, especially a description of how the thing
operates...including the plunger on the side.
I will also contact CH to see if they can do a warranty repair.

I'm not very impressed.

It may be an unloader valve which opens when the contacts open so that the
pressure in the compressor is released. This keeps the compressor from
trying to start with pressure in the cylinder(s).

Don Young