--- title: "Smeg WATER CIRCUIT EMPTY: air in the built-in's water line" description: "What WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS means on Smeg WATER CIRCUIT EMPTY: air in the built-in's water lines, what to check before booking…" url: "https://coffeemachinerepair.center/error-codes/smeg-water-circuit-empty/" --- # Smeg WATER CIRCUIT EMPTY: air in the built-in's water line If the tank runs dry or comes out while the machine is working, the pump can pull in air. ## What WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS actually means. If the tank runs dry or comes out while the machine is working, the pump can pull in air. The Smeg built-in then shows WATER CIRCUIT EMPTY and refills the line by running water from the spout. Smeg coffee machine display · also shown as WATER CIRCUIT EMPTY What to do when WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS shows on the coffee machine ### Kind of code Water and tank The machine asked for water and did not get what it expected: the tank is empty, sits off its seat or has a float the sensor cannot see, air is trapped in the line, or the flowmeter counted too little water passing in the time allowed. On a plumbed unit the same message can mean a closed shutoff, a kinked supply hose or a clogged inlet valve. Reseating a full tank and running a rinse clears the simple cases; a pump that hums with nothing moving is a visit. ### Usually leads to Coffee machine pump repair Testing and replacing the pump that drives water through the coffee, with the flowmeter that counts each cup and the valves beside it. ### Shows up as What a Coffee Machine Error Code or Warning Symbol Means A coffee machine error code may show as a short string of letters and numbers, a flashing symbol for water, grounds or the brew unit, a short sentence on a text display, or a machine that stops with one light blinking. ### Make Smeg A Smeg espresso machine is repaired at the owner's kitchen counter after a single test shot shows where the trouble begins. ### Source Smeg automatic built-in coffee machine instruction manual (linked from the US CMSU4303X, CMSU4104S and CMSU2104G pages) Smeg US built-in automatic coffee machines CMSU4303X (Classic, listed as retiring), CMSU4104S and CMSU2104G (Linea). All three link the same instruction manual, and the message appears on the full-touch display in capitals. ## Before you book, in this order. Each step comes from Smeg's own guidance for WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS on its coffee machines. Follow it to the end: the last card says whether this is a visit. 01 Make sure the tank is full and latched. 02 Fit the hot water spout, hold a cup under it and confirm; the flow stops on its own when the circuit is full. 03 Book a visit if the message returns every time, since the pump may not be drawing from the tank. ### Still there? It usually turns into [coffee machine pump repair](https://coffeemachinerepair.center/services/coffee-machine-pump-repair/). Book with the code and the model number. ### What not to do It is a priming step, not a leak. The tank-level prompt is a separate message and asks only for water in the tank. ## What you may notice with it. The coffee machine problems WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS tends to arrive with. Answer these at the coffee machine before anyone is booked. [All problems](https://coffeemachinerepair.center/problems/) Before you call ### [What a Coffee Machine Error Code or Warning Symbol Means](https://coffeemachinerepair.center/problems/coffee-machine-error-code/) [All 7 causes, cheapest first](https://coffeemachinerepair.center/problems/coffee-machine-error-code/) It also comes with - [**No Coffee Coming Out of the Coffee Machine**](https://coffeemachinerepair.center/problems/coffee-machine-no-coffee-coming-out/) - [**Loud Pump or Buzzing Noise From the Coffee Machine**](https://coffeemachinerepair.center/problems/coffee-machine-loud-pump-noise/) Problem ### What a Coffee Machine Error Code or Warning Symbol Means 7 causes, cheapest first Where WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS usually leads ## Coffee machine pump repair. **Vibration or gear pump, flowmeter, check valves and hoses · moderate.** Book a visit [What the job involves](https://coffeemachinerepair.center/services/coffee-machine-pump-repair/) ## Smeg coffee machines. A Smeg espresso machine is repaired at the owner's kitchen counter after a single test shot shows where the trouble begins. [Smeg coffee machine repair](https://coffeemachinerepair.center/brands/smeg/) More Smeg codes [FILL WATER TANK WITH FRESH WATER](https://coffeemachinerepair.center/error-codes/smeg-fill-water-tank-with-fresh-water/) [EMPTY GROUND CONTAINER](https://coffeemachinerepair.center/error-codes/smeg-empty-ground-container/) [GROUND TOO FINE. ADJUST GRIND LEVEL 1 CLICK WHILE IN OPERATION](https://coffeemachinerepair.center/error-codes/smeg-ground-too-fine/) [INSERT BREWING UNIT](https://coffeemachinerepair.center/error-codes/smeg-insert-brewing-unit/) [DESCALING NEEDED PRESS OK TO START (~45MIN)](https://coffeemachinerepair.center/error-codes/smeg-descaling-needed/) [GENERAL ALARM: REFER TO USER MANUAL](https://coffeemachinerepair.center/error-codes/smeg-general-alarm/) [CLEANING PLEASE WAIT](https://coffeemachinerepair.center/error-codes/smeg-cleaning-please-wait/) [TURN THE MILK FROTH ADJUSTMENT KNOB TO START CLEANING](https://coffeemachinerepair.center/error-codes/smeg-turn-milk-froth-knob-to-clean/) [LED 30](https://coffeemachinerepair.center/error-codes/smeg-led-30/) [LED 31](https://coffeemachinerepair.center/error-codes/smeg-led-31/) [LED 29](https://coffeemachinerepair.center/error-codes/smeg-led-29/) [All buttons flash simultaneously](https://coffeemachinerepair.center/error-codes/smeg-all-buttons-flash/) [All 15 Smeg codes](https://coffeemachinerepair.center/error-codes/#codes-smeg) Water and tank on other makes [Bertazzoni Fill water tank with fresh water](https://coffeemachinerepair.center/error-codes/bertazzoni-fill-water-tank-with-fresh-water/) [Bosch Error in water system](https://coffeemachinerepair.center/error-codes/bosch-error-in-water-system/) [Fisher & Paykel FILL TANK WITH FRESH WATER](https://coffeemachinerepair.center/error-codes/fisher-and-paykel-fill-tank-with-fresh-water/) [Fulgor Milano FILL TANK!](https://coffeemachinerepair.center/error-codes/fulgor-milano-fill-tank/) [Gaggenau Fill water tank](https://coffeemachinerepair.center/error-codes/gaggenau-fill-water-tank/) [JennAir FILL TANK!](https://coffeemachinerepair.center/error-codes/jennair-fill-tank/) [Jura Fill water tank](https://coffeemachinerepair.center/error-codes/jura-fill-water-tank/) [Miele Push the water container in until it engages](https://coffeemachinerepair.center/error-codes/miele-push-the-water-container-in-until-it-engages/) [All 18 codes of this kind](https://coffeemachinerepair.center/error-codes/#family-water) Smeg builds this ### Built-in coffee system The coffee machine set flush into a tall kitchen cabinet, filled from a water tank behind its front, grinding beans and brewing each cup on its own before sliding out on rails for service. Smeg builds this ### Countertop espresso machine The fully automatic bean-to-cup machine that stands on the counter, grinding, tamping, brewing and frothing at the touch of a key, with its tank, hopper and grounds drawer all reached from the top and the front. Smeg builds this ### Manual espresso machine The home espresso machine with a portafilter you fill and lock in by hand, a pump and a boiler or thermoblock inside, and a steam wand for milk you froth yourself. ## In Smeg's own words > The water circuit is empty [Smeg automatic built-in coffee machine instruction manual (linked from the US CMSU4303X, CMSU4104S and CMSU2104G pages)](https://doc.smeg.it/qr/914779197/EN) [Smeg automatic built-in coffee machine instruction manual (linked from the US CMSU4303X, CMSU4104S and CMSU2104G pages)](https://doc.smeg.it/qr/914779197/EN) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Smeg US built-in automatic coffee machines CMSU4303X (Classic, listed as retiring), CMSU4104S and CMSU2104G (Linea). All three link the same instruction manual, and the message appears on the full-touch display in capitals. ## Smeg WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS coffee machine repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. [All service areas](https://coffeemachinerepair.center/locations/) [Tampa Bay](https://coffeemachinerepair.center/locations/tampa-bay/) FL · 31 areas - [Hyde Park](https://coffeemachinerepair.center/locations/tampa-bay/hyde-park/) - [Davis Islands](https://coffeemachinerepair.center/locations/tampa-bay/davis-islands/) - [Palma Ceia](https://coffeemachinerepair.center/locations/tampa-bay/palma-ceia/) - [Westchase](https://coffeemachinerepair.center/locations/tampa-bay/westchase/) - [Carrollwood](https://coffeemachinerepair.center/locations/tampa-bay/carrollwood/) - [Belleair](https://coffeemachinerepair.center/locations/tampa-bay/belleair/) - [St. Pete Beach](https://coffeemachinerepair.center/locations/tampa-bay/st-pete-beach/) - [Palm Harbor](https://coffeemachinerepair.center/locations/tampa-bay/palm-harbor/) [Orlando](https://coffeemachinerepair.center/locations/orlando/) FL · 30 areas - [Winter Park](https://coffeemachinerepair.center/locations/orlando/winter-park/) - [Windermere](https://coffeemachinerepair.center/locations/orlando/windermere/) - [Dr. Phillips](https://coffeemachinerepair.center/locations/orlando/dr-phillips/) - [Bay Hill](https://coffeemachinerepair.center/locations/orlando/bay-hill/) - [Lake Nona](https://coffeemachinerepair.center/locations/orlando/lake-nona/) - [Heathrow](https://coffeemachinerepair.center/locations/orlando/heathrow/) - [Celebration](https://coffeemachinerepair.center/locations/orlando/celebration/) [Miami / South Florida](https://coffeemachinerepair.center/locations/south-florida/) FL · 47 areas - [Brickell](https://coffeemachinerepair.center/locations/south-florida/brickell/) - [Coconut Grove](https://coffeemachinerepair.center/locations/south-florida/coconut-grove/) - [Coral Gables](https://coffeemachinerepair.center/locations/south-florida/coral-gables/) - [Pinecrest](https://coffeemachinerepair.center/locations/south-florida/pinecrest/) - [Key Biscayne](https://coffeemachinerepair.center/locations/south-florida/key-biscayne/) - [Aventura](https://coffeemachinerepair.center/locations/south-florida/aventura/) - [Sunny Isles Beach](https://coffeemachinerepair.center/locations/south-florida/sunny-isles-beach/) - [Bal Harbour](https://coffeemachinerepair.center/locations/south-florida/bal-harbour/) - [Miami Beach](https://coffeemachinerepair.center/locations/south-florida/miami-beach/) - [Golden Beach](https://coffeemachinerepair.center/locations/south-florida/golden-beach/) - [Weston](https://coffeemachinerepair.center/locations/south-florida/weston/) - [Boca Raton](https://coffeemachinerepair.center/locations/south-florida/boca-raton/) - [Palm Beach](https://coffeemachinerepair.center/locations/south-florida/palm-beach/) [New York Metro](https://coffeemachinerepair.center/locations/new-york/) NY · 75 areas - [Upper East Side](https://coffeemachinerepair.center/locations/new-york/upper-east-side/) - [Upper West Side](https://coffeemachinerepair.center/locations/new-york/upper-west-side/) - [Tribeca](https://coffeemachinerepair.center/locations/new-york/tribeca/) - [SoHo](https://coffeemachinerepair.center/locations/new-york/soho/) - [Greenwich Village](https://coffeemachinerepair.center/locations/new-york/greenwich-village/) - [Battery Park City](https://coffeemachinerepair.center/locations/new-york/battery-park-city/) - [Brooklyn Heights](https://coffeemachinerepair.center/locations/new-york/brooklyn-heights/) - [Park Slope](https://coffeemachinerepair.center/locations/new-york/park-slope/) - [DUMBO](https://coffeemachinerepair.center/locations/new-york/dumbo/) - [Forest Hills](https://coffeemachinerepair.center/locations/new-york/forest-hills/) - [Great Neck](https://coffeemachinerepair.center/locations/new-york/great-neck/) - [Southampton](https://coffeemachinerepair.center/locations/new-york/southampton/) - [Scarsdale](https://coffeemachinerepair.center/locations/new-york/scarsdale/) [Houston](https://coffeemachinerepair.center/locations/houston/) TX · 36 areas - [River Oaks](https://coffeemachinerepair.center/locations/houston/river-oaks/) - [Memorial](https://coffeemachinerepair.center/locations/houston/memorial/) - [Tanglewood](https://coffeemachinerepair.center/locations/houston/tanglewood/) - [Greater Heights](https://coffeemachinerepair.center/locations/houston/greater-heights/) - [Kingwood](https://coffeemachinerepair.center/locations/houston/kingwood/) - [Bellaire](https://coffeemachinerepair.center/locations/houston/bellaire/) - [Bunker Hill Village](https://coffeemachinerepair.center/locations/houston/bunker-hill-village/) - [Piney Point Village](https://coffeemachinerepair.center/locations/houston/piney-point-village/) - [Hunters Creek Village](https://coffeemachinerepair.center/locations/houston/hunters-creek-village/) - [Sugar Land](https://coffeemachinerepair.center/locations/houston/sugar-land/) - [Cinco Ranch](https://coffeemachinerepair.center/locations/houston/cinco-ranch/) - [The Woodlands](https://coffeemachinerepair.center/locations/houston/the-woodlands/) - [West University](https://coffeemachinerepair.center/locations/houston/west-university/) [Chicago](https://coffeemachinerepair.center/locations/chicagoland/) IL · 50 areas - [Lincoln Park](https://coffeemachinerepair.center/locations/chicagoland/lincoln-park/) - [Near North Side](https://coffeemachinerepair.center/locations/chicagoland/near-north-side/) - [West Loop / Near West Side](https://coffeemachinerepair.center/locations/chicagoland/west-loop-near-west-side/) - [Wilmette](https://coffeemachinerepair.center/locations/chicagoland/wilmette/) - [Winnetka](https://coffeemachinerepair.center/locations/chicagoland/winnetka/) - [Glencoe](https://coffeemachinerepair.center/locations/chicagoland/glencoe/) - [River Forest](https://coffeemachinerepair.center/locations/chicagoland/river-forest/) - [Oak Park](https://coffeemachinerepair.center/locations/chicagoland/oak-park/) - [Hinsdale](https://coffeemachinerepair.center/locations/chicagoland/hinsdale/) - [Lake Forest](https://coffeemachinerepair.center/locations/chicagoland/lake-forest/) - [Highland Park](https://coffeemachinerepair.center/locations/chicagoland/highland-park/) - [Gold Coast](https://coffeemachinerepair.center/locations/chicagoland/gold-coast/) - [Lakeview](https://coffeemachinerepair.center/locations/chicagoland/lakeview/) [Los Angeles](https://coffeemachinerepair.center/locations/los-angeles/) CA · 95 areas - [Beverly Hills](https://coffeemachinerepair.center/locations/los-angeles/beverly-hills/) - [Bel Air](https://coffeemachinerepair.center/locations/los-angeles/bel-air/) - [Holmby Hills](https://coffeemachinerepair.center/locations/los-angeles/holmby-hills/) - [Brentwood](https://coffeemachinerepair.center/locations/los-angeles/brentwood/) - [Pacific Palisades](https://coffeemachinerepair.center/locations/los-angeles/pacific-palisades/) - [Santa Monica](https://coffeemachinerepair.center/locations/los-angeles/santa-monica/) - [Hancock Park](https://coffeemachinerepair.center/locations/los-angeles/hancock-park/) - [Studio City](https://coffeemachinerepair.center/locations/los-angeles/studio-city/) - [Calabasas](https://coffeemachinerepair.center/locations/los-angeles/calabasas/) - [Manhattan Beach](https://coffeemachinerepair.center/locations/los-angeles/manhattan-beach/) - [Palos Verdes Estates](https://coffeemachinerepair.center/locations/los-angeles/palos-verdes-estates/) - [Pasadena](https://coffeemachinerepair.center/locations/los-angeles/pasadena/) - [San Marino](https://coffeemachinerepair.center/locations/los-angeles/san-marino/) - [Malibu](https://coffeemachinerepair.center/locations/los-angeles/malibu/) [San Diego](https://coffeemachinerepair.center/locations/san-diego/) CA · 31 areas - [La Jolla](https://coffeemachinerepair.center/locations/san-diego/la-jolla/) - [Carmel Valley](https://coffeemachinerepair.center/locations/san-diego/carmel-valley/) - [Point Loma](https://coffeemachinerepair.center/locations/san-diego/point-loma/) - [Del Mar](https://coffeemachinerepair.center/locations/san-diego/del-mar/) - [Rancho Santa Fe](https://coffeemachinerepair.center/locations/san-diego/rancho-santa-fe/) - [Coronado](https://coffeemachinerepair.center/locations/san-diego/coronado/) - [Encinitas](https://coffeemachinerepair.center/locations/san-diego/encinitas/) - [Solana Beach](https://coffeemachinerepair.center/locations/san-diego/solana-beach/) [San Francisco Bay Area](https://coffeemachinerepair.center/locations/bay-area/) CA · 74 areas - [Pacific Heights](https://coffeemachinerepair.center/locations/bay-area/pacific-heights/) - [Presidio Heights](https://coffeemachinerepair.center/locations/bay-area/presidio-heights/) - [Russian Hill](https://coffeemachinerepair.center/locations/bay-area/russian-hill/) - [Noe Valley](https://coffeemachinerepair.center/locations/bay-area/noe-valley/) - [Sea Cliff](https://coffeemachinerepair.center/locations/bay-area/sea-cliff/) - [Hillsborough](https://coffeemachinerepair.center/locations/bay-area/hillsborough/) - [Atherton](https://coffeemachinerepair.center/locations/bay-area/atherton/) - [Woodside](https://coffeemachinerepair.center/locations/bay-area/woodside/) - [Palo Alto](https://coffeemachinerepair.center/locations/bay-area/palo-alto/) - [Los Altos Hills](https://coffeemachinerepair.center/locations/bay-area/los-altos-hills/) - [Tiburon](https://coffeemachinerepair.center/locations/bay-area/tiburon/) - [Piedmont](https://coffeemachinerepair.center/locations/bay-area/piedmont/) - [Marina](https://coffeemachinerepair.center/locations/bay-area/marina/) For the heart of your home. ## Questions about WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS. ### Can I clear WATER CIRCUIT EMPTY PRESS OK TO START FILLING PROCESS myself? Make sure the tank is full and latched. If it comes back, it needs a visit. ### Why does my Smeg show WATER CIRCUIT EMPTY after sitting unused? Water can drain back and let air into the line. Smeg also suggests two or three rinse cycles after three or four days without use. ### Is it safe to run the prime on a Smeg built-in myself? Yes, it is the manual's own step. Keep hands clear of the spout, because the water comes out hot. ### Why is my Smeg pump loud when this message shows? It is pushing air. The noise should settle once water flows; if the noise continues and no water appears, switch off and book a visit. --- **[Read on the site: Smeg WATER CIRCUIT EMPTY: air in the built-in's water line](https://coffeemachinerepair.center/error-codes/smeg-water-circuit-empty/)** **[Book a visit with CoffeeMachineRepair.center](https://coffeemachinerepair.center/schedule/)**