HI Paul--

The switches can be finicky.  I've had that problem both in trying to 
turn the pumps off as well as turn them on.  You just have to keep 
playing with them--maybe try "rocking" them instead of just pushing 
them, or push them up as well as in (or down as well as in).  Sorry I 
don't have a sure-fire way.

good luck

take care

gerry

Paul Eby wrote:
> Hello all,
>
> I'm looking for assistance with a problem after a power outage: the 
> pumps on our Delta Plus XL will not turn back on.
>
> When I toggle the source pump button, nothing happens (LED light does 
> not come on, no pump activity). The instrument does indeed have power 
> (various fans and electronics are humming), and I have reset the 
> breakers on the back.
>
> The roughing pump itself is fine - it works fine when plugged into a 
> hot socket. I've also gone through the system looking for blown fuses 
> and loose cables. I've also left it unplugged for a few hours hoping 
> for a miraculous reset of some sort. No luck.
>
> Any ideas?
>
> Paul Eby
>
> [log in to unmask]
> Biogeochemistry Lab (E-Hut, room 102)
> School of Earth and Ocean Science
> University of Victoria
>
> PO Box 3055
> Victoria, B.C.
> Canada
> V8W 3P6
>
> phone: 250-721-6183
> fax:   250-472-4620