Post By Pitt22
Alex Duetto III - Limp mode
I'm mechanically minded but seeking higher wisdom on this one.
My much anticipated Duetto purchased from this forum arrived Friday. It was shipped from Brisbane to Melbourne strapped to a pallet in original packaging. It arrived in perfect condition but I can't discount the riggers of transport contributing to this fault. The machine was serviced before being sold.
After an initial warm up period the machine pulls shots no problem.
When I return to the machine after a few hours I pull the handle, the pump runs, and the group dribbles a small amount. The pump runs constantly and the PID goes off when I close the handle.
I switch the machine off to spare the pump. If I turn the machine back on in 15-20 mins it pours fine but eventually faults again. Steam and boiler tap work fine.
Weird. The pump running with no flow is not a huge bad thing for short period as it recirculates in the pump head. Ie not stalled.
Have you popped the lid to see if anything has dislodged? connections, plugs, loose screw lying on a terminal or similar? The only electrical thing the group lever controls is the pump switch, the rest is all mechanical.
Thanks artman I'll have a look this evening.
My other thought was maybe some scale dislodged in transit creating intermittent blockage. Chem backflush might be worth a go.
I do feel this is somehow temperature related but diagnoses has never been my strong suit.
Seth, probably asking the obvious, but have you asked the vendor (and the servicing company if you have a copy of their invoice) if they have any ideas? They may have experienced similar or another fault which may point you in the right direction.
This issue is a surprise to the vendor and he has been great to deal with. I haven't sighted a service invoice but might ask as I'm interested to know who it was and what they've done. I've no doubt it has been stripped down. Found this nut underneath which doesn't look right. Perhaps Artman can confirm this? The chassis is also very loose. Much more than I'd expect shipped in original packaging strapped to It's own pallet.
You have my sympathy, frustrating issue on a new to you machine
Issue resolved. Sticking valve beside the pump. Thanks to George at 'Specialist Espresso', formerly 'The Coffee Man') for the repair.