What's wrong with your shot?

"Shot sprays everywhere and tastes sour"

Likely cause: Nine times out of ten, the factory OPV. Gaggia ships at 15 bar, and 15 bar on fresh coffee just channels. The puck can't hold.

Check: Pull a shot with a bottomless portafilter. If it sprays from one spot instead of a single stream, that's channeling - your puck gave up.

Fix: Drop in a 9 bar OPV spring. First mod every Gaggia owner makes, and for good reason.

Gaggia Classic Pro PID install →

"Wet puck and black flakes in the cup"

Likely cause: Two suspects. Scale, or - if you're on an Evo Pro - the boiler coating letting go. I've seen the "Boilergate" flakes firsthand. They're real.

Check: Pull the portafilter and look at the puck. Then check the group head for black specks. Anything that looks like pepper is a red flag.

Fix: Descale first, always. If you've got an Evo Pro with the coated boiler and the flakes come back after a descale, the coating is failing - don't keep chasing it.

Black flakes: scale, coating, or boiler corrosion →

"Steam is weak, milk won't microfoam"

Likely cause: Single-hole wand and not much steam pressure. The machine just doesn't have the steam to paint milk properly.

Check: Time your milk. If you're over 30 seconds to get texture, the wand is the bottleneck.

Fix: Upgrade the steam wand and knob, and tighten your routine. You'd be surprised how much of it is technique once the hardware cooperates.

Steam knobs, steam power, and workflow →

"Temperature drifts between shots"

Likely cause: The bimetal thermostat has a 10-15C deadband. That's not temperature control - that's guessing. If you're temp-surfing, this is why.

Check: Are you watching the ready light and counting? That's the tell.

Fix: Install a PID. Locks brew temp to 0.1C and you stop guessing.

Gaggia Classic Pro PID install →

"No water from the group head"

Likely cause: Three usual suspects: 3-way solenoid blocked, pump dead, or scale choking it.

Check: Listen to the pump. If it hums but nothing comes out, you've got a solenoid or a blockage - not a dead pump.

Fix: Descale the solenoid first. If the pump's actually dead, replace it. Don't guess - test.

No water from the group head: solenoid, scale, or pump →

"GFCI trips the moment it heats"

Likely cause: Heating element insulation has broken down. The element is leaking to the boiler shell, and the GFCI is doing its job. I wouldn't keep running it.

Check: Unplug it. Multimeter on continuity - one probe on an element terminal, one on the boiler shell. Should read OL. If it beeps, the element is gone.

Fix: Replace the heating element. Don't run it again until you do. This is a safety thing, not a preference.

Mod safety matrix and multimeter checks →

"Shot sprays and tastes sour"

Likely cause: 15 bar from the factory - same story as the Gaggia. Too much pressure, puck channels.

Check: Bottomless portafilter. If it sprays, you're channeling.

Fix: Calibrate the OPV down to 9 bar. The method: 130ml in 30 seconds out of the OPV return line. That's your target.

Rancilio Silvia guide →

"Temperature surfing is driving me crazy"

Likely cause: Bimetal thermostat deadband. Silvia is famous for it - I've spent more time than I care to admit counting seconds after that light.

Check: If you're counting seconds after the ready light goes off, you're surfing. And you hate it.

Fix: Install an Auber PID. Stop counting.

Rancilio Silvia guide →

"Steam is weak"

Likely cause: Single-hole wand. Same problem as the Gaggia - not enough steam to texture milk properly.

Fix: V3 ball-joint steam wand upgrade. Known fix, well-documented.

Rancilio Silvia guide →

"Center channeling and my puck screen won't fit"

Likely cause: That protruding factory screw in the group head is gouging the center of your puck. The puck screen won't even sit flat.

Fix: Flat Shower Screen countersink mod. Sink the screw flush. The screen fits, the channeling stops.

Rancilio Silvia guide →

"Shot pours way too fast and tastes sour"

Likely cause: Pressurized basket plus grind too coarse. The pressurized basket hides bad grind - that's the whole point of it. I see this on every Dedica that walks in.

Fix: Swap to a 51mm non-pressurized basket and dial in the grind. Now the coffee tells you the truth.

Dedica EC685 guide →

"Milk foam is dry and coarse, no microfoam"

Likely cause: Panarello wand makes foam. It doesn't make microfoam. It can't.

Fix: Rancilio Silvia steam wand transplant. Classic Dedica mod for a reason.

Dedica EC685 guide →

"No water, pump runs dry"

Likely cause: Airlock in the pump. The pump is running but it's pushing air, not water.

Fix: Prime the pump. Run hot water through the steam wand to bleed the air out. Takes a minute.

Dedica EC685 guide →

"LED blinking a pattern"

Likely cause: The machine is throwing a fault code. Those blinks mean something.

Fix: Decode the LED pattern against the diagnostic table and follow the service flow. Don't guess - the table is right there.

Dedica EC685 guide →

"Pressure too high, channeling"

Likely cause: 15 bar from the factory, and no OPV to speak of. Same channeling story.

Fix: Dimmer preinfusion mod, or add an OPV. Either gets you off the 15 bar cliff.

Dedica EC685 guide →

"Pressure won't build"

Likely cause: Piston seal is worn, or the cylinder wall is scored. Pressure is leaking past one of them.

Check: Inspect the seal and the cylinder wall. Look for wear, tears, scratches - anything that breaks the seal.

Fix: Replace the seal. If the cylinder is scored, polish it. A scored cylinder will eat the next seal too.

Flair 58 guide →

"Temperature drops mid-shot"

Likely cause: Thermal layering. The cold brew head is leaching heat out of your shot as you pull it.

Fix: Preheat longer. Add a thermal sleeve. Stop giving your heat away to the cylinder.

Flair 58 guide →

"Channeling"

Likely cause: Puck prep or grind. On a lever, bad prep shows up loud - there's no pump to hide behind. I'd start with WDT before blaming the machine.

Fix: WDT, level tamp, dial in the grind. The basics, done right.

Flair 58 guide →

"Lever feels stuck"

Likely cause: Grind too fine, or the piston is binding. One is a coffee problem, one is a machine problem.

Fix: Try a coarser grind first. If it's still sticking, check the piston for binding.

Flair 58 guide →

"Shot sprays and tastes sour"

Likely cause: 12 bar from the factory OPV. Better than 15, still too high. The puck channels.

Fix: Calibrate the OPV down to 9 bar. Standard fix.

Lelit Anna PL41 guide →

"Steam is weak"

Likely cause: Single-hole steam tip. Same story on every Italian single-boiler in this class.

Fix: Multi-hole steam tip and a new O-ring. Cheap fix, big difference.

Lelit Anna PL41 guide →

"PID temp reads wrong vs actual brew temp"

Likely cause: The F.04 offset isn't calibrated. The PID shows a number, but the number is lying to you.

Fix: Flash-boil calibration of the F.04 offset. Get the PID to tell the truth.

Lelit Anna PL41 guide →

"57mm channeling"

Likely cause: Basket or distribution. The stock basket is a weak link, and 57mm is a weird size - prep matters more.

Fix: IMS 57mm precision basket and WDT. The basket alone fixes half of it.

Lelit Anna PL41 guide →

"Scale build-up"

Likely cause: Water hardness. If you're running tap water, this is the bill coming due. I tell everyone: filtered water, or descale every three months.

Fix: Descale, and switch to filtered water. Or you'll be back here in three months.

Lelit Anna PL41 guide →