Single-group precision, restored
The Mina is the kind of machine people buy on purpose, which makes a dead morning with it twice as annoying. We repair these single-group flow-profiling rigs at the counter: sticking needle valves, PID drift, weak steam, doses that wander. Describe what the shot is doing and we'll usually know which part to bring.
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Dalla Corte · Single-group specialty espresso with manual flow profiling
The Mina is Dalla Corte's single-group machine and the one that brought manual flow profiling to the platform. A dedicated brew boiler with PID, a separate steam boiler, and a needle-valve regulator let the barista shape the shot in real time. Specialty bars and espresso labs run it hard, and from the service side the regulator is the part that rewards respect: it's precision geometry, not a tap.
Why Grajqevci
Call in the morning and a technician is usually on-site before the day is out. Most Dalla Corte Mina jobs get diagnosed and fixed on the first visit.
Commercial coffee equipment is all we do, and Dalla Corte Mina is part of the weekly rotation. Not a generalist guessing at a service manual. Genuine OEM parts, industry-standard procedures.
Flat rate for the visit, with parts billed separately. For bigger jobs you'll see a written quote on-site before we proceed.
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Mina faults we diagnose
The Mina faults below are the ones that actually book service calls, each with its usual cause and the fix we apply at the counter.
The Mina's needle-valve flow regulator is a precision component, and sediment, scale, or seat wear will make it stick or meter unevenly. We disassemble the regulator, clean the needle and seat, fit a new seal kit, and verify smooth flow control across the full range before we call it done.
A standard wear item every 12 to 18 months. We pull the dispersion screen and shower screw, replace the gasket, descale the screen, and confirm a clean seal under brew pressure.
Coffee oils and fines building up on the screen are the usual cause. We fit a new dispersion screen and backflush the group with detergent, and the shots pour evenly again.
Rotary pump wear or expansion-valve drift, most of the time. We gauge brew pressure at the portafilter, measure the pump's output to atmosphere, and adjust the expansion valve. If pump output is below spec, you get a replacement quote first.
Either the pre-infusion solenoid is hesitating or the programming has reverted. We test the solenoid, verify the pre-infusion profile through the service menu, and replace the solenoid if it's slow to actuate.
Either the NTC sensor is wearing or the PID calibration has drifted. We test the sensor against a reference probe, recalibrate the PID through the service interface, and replace the sensor if it reads out of spec.
Scale, pressurestat drift, or a degrading element. We descale the steam boiler, test the pressurestat at its setpoint, and replace whichever component the measurements condemn.
On a single-group machine, scale on the brew boiler element makes a measurable difference. A proper descale brings heat-up back to spec, and we verify the timing before we leave.
We pressure-test the brew and boiler circuits to find the source, then replace the failed seal or fitting and confirm the machine runs dry.
Usually a blocked drain hose or plumbing without enough fall. We clear the drain and correct the slope if that's the real problem.
Cartridge wear, plain and simple. We rebuild the valve with the correct Dalla Corte cartridge and confirm a dry shut-off.
Scale in the steam circuit or an eroded tip restricts the flow. We descale the circuit, clear the tip jets, and fit a new tip if the old one is past saving.
We diagnose whether the fault sits in the controller board, the UI module, or the wiring between them, then replace only the failing piece, sourced through the Dalla Corte/Franke parts network.
Almost typically mineral buildup in the flow meter. We pull the meter, clean the impeller, verify the pulse output, and reprogram your doses.
A scaled level probe reads full when the boiler isn't, so autofill behaves erratically. We descale or replace the probe and watch the fill cycle run correctly before closing up.
Your coffee emergency ends here
Call or submit the form. We confirm your address, model, and the issue.
An experienced technician arrives, runs full diagnostics, and identifies the root cause.
You receive a flat, itemized quote. Nothing proceeds without your green light.
We complete the repair, run a test cycle, and walk you through what to watch for.
Parts on the truck
What we've done
Our two-group went down right before the morning rush and they had a tech out the same day. Back in business before our regulars noticed.
*Estimated based on the approximate distance from our nearest service centre, average commute time, and median service-call length for one machine. Prices in Canadian dollars (CAD $). Final quote provided on-site after diagnosis.
FAQ
21 answers covering service, repair, parts, installation, warranty, and edge cases.
Updated July 2026
Sediment, scale, or a worn valve seat, almost always. The regulator is a precision needle valve, and tiny mineral deposits are enough to make modulation feel gritty or inconsistent. We strip it, clean the needle and seat, fit a new seal kit, and verify smooth control across the full range. Forcing a binding lever only scores the seat, so book it early.
It's rated for up to 150 shots a day, which covers most single-station bars with room to spare. Push it consistently past that and wear shows up first in the group gasket and the steam valve. If your volume has outgrown it, we'll tell you honestly rather than keep billing repairs.
Three usual suspects: rotary pump wear, expansion-valve drift, or a flow regulator that's started sticking. We gauge brew pressure at the portafilter, measure pump output, and test the regulator's travel. Each has a clear measurement, so you get a diagnosis rather than a guess.
The brew boiler runs its own NTC sensor and PID, and either can drift with age. We test the sensor against a reference probe, recalibrate the PID through the service interface, and replace the sensor if it reads out of tolerance. Drift is usually gradual, so trust your palate if shots have slowly gone sour or flat.
Sometimes, but check the simple things first: scale in the steam circuit and a partially blocked tip cause most weak-steam calls. If the boiler genuinely can't hold pressure, the pressurestat or element is the suspect. We descale, clear the tip jets, and test both components at the gauge.
Usually a blocked drain hose or a drain run without enough fall. We clear the line and correct the plumbing slope if that's the real problem. If the overflow comes with water under the machine, mention it when you book; that points at a seal instead.
Yes, and it's nearly always mineral buildup in the flow meter rather than the controller. We pull the meter, clean the impeller, verify the pulse output, and reprogram your doses. If it recurs quickly, your water filtration needs a look.
Dalla Corte's own DC One is the natural partner, and the Mina also pairs happily with third-party specialty grinders. From the service side, what matters is that grinder drift gets ruled out before the machine takes the blame. We check both on the same visit.
At the bar for nearly everything: regulator rebuilds, boiler work, valve cartridges, and calibration all happen in place. It's a compact, logically laid-out machine. Only severe water damage or a full rebuild would send it to a bench, and we'd tell you that before moving it.
Flat rate for the visit, parts billed at their actual cost on top. You'll hear the rate when you book, and for bigger jobs we quote in writing on-site before any work starts. No estimate that balloons mid-job.
Same-day in most cases. Call in the morning and a technician is usually on-site before the day is out; calls placed later in the day book for the next morning. Urgent breakdowns get priority routing.
The GTA and most of the Golden Horseshoe: Toronto through Mississauga, Vaughan, and Markham, out to Oshawa, Hamilton, and Niagara. If you're not sure you're in range, call and we'll tell you straight.
No. We work call by call. Plenty of customers put us on a maintenance schedule eventually, but that's their choice after seeing the work, never a requirement.
Parts carry their manufacturer warranty, and we stand behind our labour: if the same fault recurs, call us and we'll review it. Specific terms are discussed upfront on each job, not promised in marketing copy.
On-site whenever possible, which is most of the time. If a job genuinely needs the bench, like a full boiler rebuild or major electronics work, we'll say so before anything leaves your building.
Call us or send the form on this page. We confirm the machine, the fault, and a time window the same day. If it's urgent, say so and we'll route the nearest technician.
Diagnosis first: we confirm the fault, tell you what caused it, and quote the fix before touching a wrench. Most repairs finish in that same visit because the common wear parts ride on the truck.
High-wear parts for the platforms we service constantly ride on the truck. Anything else we order, usually next-day where suppliers allow, and we tell you the lead time before committing you to anything.
Usually, yes. We service legacy machines for as long as parts can be sourced, and we're honest when a repair stops making financial sense against a replacement. You get the math, you make the call.
Often, but that's not the pitch. We quote against the actual work, not a factory pricing book, and we'll tell you when a manufacturer warranty claim is the better route. Transparency is the value; the price usually follows.
Yes, and we do it by default on the way out. Half of repeat faults trace back to skipped daily cleaning or wrong routine, so the technician walks your team through what actually matters before leaving.
One call reaches a technician who knows this needle valve by feel.
Call (289) 217-3796 now →