Miele Refrigerator Repair in Toronto — Ice maker not working

• F121 is the code that owns the dead-ice-maker call on Miele MasterCool columns and F-series freezers (K/KF/F 1801/1901/2901 generations) - Miele's own support pages (mieleusa.com, miele.co.uk) read it literally as 'the ice maker is defective.' Before any part comes off the van we run Miele's published recovery: switch the appliance off and back on to clear a latched F121 and confirm the household water supply is open. On older units the same ice fault shows as the '01 _F 21' display, which Miele's recovery resets via the toggle switch under the electronic touch panel. A genuine, re-firing F121 after that reset is what justifies opening the maker, not the first occurrence of the code.
• The single most common physical cause behind a re-latching F121 is exactly what Miele's F121 guidance lists - water pressure too low at the inlet, so the intake valve weeps instead of filling cleanly, the dribble freezes at the fill cup and tube, and the ice slug mechanically jams the mould so no harvest completes. Miele's page explicitly names low water pressure and a faulty water inlet among the causes to rule out before replacing the maker, so we meter incoming pressure and inspect the fill tube for an ice plug first; clearing the frozen fill path and restoring proper pressure resolves a large share of these without a new ice unit.
• When the harvest mechanism itself is dead - mould heats and the cycle runs but cubes never release, or the tray cracks/binds - the genuine repair is the Miele ice-tray sub-assembly 10261731 (the cube-mould/tray module; a sibling tray sub-assembly 10261761 and the bare ice tray 10098650 appear on the same platform, so we confirm the exact unit by serial before ordering). But Miele's own F121 page also lists a blocked ice-dispenser output flap and a faulty ice crusher as causes to rule out first, so we check the dispenser path and crusher action and bench the mould heater and cycle before fitting a new tray sub-assembly rather than guessing.
• A 'maker is full of water but the cubes taste off / clump / production crawled to nothing' F121 frequently traces to a spent or clogged IntensiveClear KWF 1000 filter (11513640) starving the maker - Miele specs it for MasterCool F 1xxx/F 2xx1/KF 1xxx/KF 2xx1 ice-and-water models and calls for replacement roughly every 6 months. On a re-start Miele notes ice production can take up to 24 hours to begin and that the first ice should be discarded, so we change the filter, purge the line, and verify a clean fill cycle before quoting any electronic part.
• No-water-at-all-to-the-maker is the inlet/solenoid valve story rather than the mould: the maker calls for fill, the valve doesn't open (or a kinked/iced supply line behind a built-in column blocks it), and the box throws F121 with a bone-dry tray. We verify the valve energizes and that the saddle/shut-off behind the cabinet is fully open, since a closed supply or a failed fill solenoid presents identically to a dead maker on the display - Miele's guidance explicitly has us confirm the water supply is open and flags a faulty water inlet before touching the maker.
• Distinguish a true ice-maker-dead (F121) from a not-cooling-driven icing problem: if the whole freezer compartment is warm or the evaporator is iced, the maker stops as a downstream symptom and the real fault is the cooling/defrost circuit (NTC sensor 7323301/7323302, F1/F2) or the defrost-drain icing slab - not the ice unit. We confirm the freezer is actually holding temperature first, because replacing an ice-tray sub-assembly on a box that isn't cold enough to freeze is a wasted part.
• Coded electronic-board faults and sealed-system work behind a persistent ice-maker fault remain Miele Canada's call and route factory-direct - the everyday F121 fixes an independent closes are the frozen/low-pressure fill path, the KWF 1000 (11513640), the inlet/fill solenoid, and the mechanical ice-tray sub-assembly (10261731); anything that points back to the control board after those are ruled out gets quoted per serial through the factory channel.

Miele ice maker not working in Toronto — the local specifics

• The recurring Toronto pattern on Miele ice-maker-dead calls is that the F121 has already been on the display for a while and the owner has tried the off/on reset - and when we get there the fill path is iced from a low-pressure or weeping inlet behind a built-in column, or the KWF 1000 is long overdue, rather than the mould itself being dead. The genuinely mechanical 'tray won't harvest' failures that actually need the 10261731 ice-tray sub-assembly are the smaller share; most of these close at the water/fill side once we restore pressure, clear the ice plug, and change the filter.
• We carry to these calls the KWF 1000 IntensiveClear filter (11513640), an inlet/fill solenoid valve, and the means to thaw and clear a frozen fill tube; we confirm the exact ice-tray sub-assembly (10261731, or the serial-matched 10261761) by the unit's serial and order it in rather than stocking the wrong mould, and we verify water pressure at the saddle valve before condemning the maker.

For the full Miele refrigerator module — every fault, part number and code — see Miele refrigerator repair in Toronto, and for the same fault across all brands the refrigerator ice maker not working guide.