Miele Refrigerator F21 / F22: Ice Maker Water & Harvest Faults

F21 is the ice maker’s water supply; F22 is its harvest cycle. F21 means the inlet valve feeding the ice maker misbehaves — wrong solenoid reading or no confirmed flow. F22 means the tray filled but the harvest motor can’t complete a cycle: cubes don’t eject, the ejector stalls, or the unit times out. Both leave the bin empty, but the repair paths are completely different, which is why we test rather than swap.

What’s actually behind it

In frequency order from our Pleasant Hill and Lamorinda calls:

1. A frozen fill tube (F21) — the small tube feeding the tray freezes shut; panel-ready doors and low freezer airflow hide it for months.
2. The inlet valve solenoid (F21) — coil resistance drifts out of spec with age; measured in seconds, replaced in under an hour.
3. Supply problems (F21) — a clogged filter past its 6-month life or a half-closed shutoff valve starving the line (Miele spec: 30–120 PSI at the valve).
4. The ice maker unit itself (F22) — harvest motor or internal thermostat worn; on integrated units this is a Miele OEM assembly, not a generic part.
5. Door-hinge wiring (either) — on column units the harness flexes thousands of times a year; an intermittent break mimics both codes.

Can you do anything yourself?

Three safe checks: replace or bypass an overdue water filter; confirm the shutoff valve on the supply line is fully open; and look into the fill tube above the ice maker for visible ice (a hair dryer on low, kept moving, clears a mild freeze-up). Then one power cycle and 24 hours of patience — a healthy ice maker produces a first batch within a few hours.

If it still won’t produce, stop there. We run a force-harvest test through Miele service software — it commands the motor and ejector through a full cycle while we watch current draw — and measure the valve solenoid against spec. That single test separates a valve job from a unit job from a wiring job. Most ice maker repairs complete in a single visit with genuine Miele OEM parts; more on our Miele refrigerator repair page.

FAQ

Water dispenses fine but there’s no ice — F21?

Very likely. The door dispenser and the ice maker use separate valves on most MasterCool configurations — one can be perfect while the other is dead. It actually helps the diagnosis: it rules out household supply pressure.

Cubes are small, hollow or misshapen.

That’s underfilling — a starving inlet valve, a clogged filter or low pressure, i.e. early-F21 territory. Catch it now and it’s usually the cheap version of this repair.

The ice maker stopped right after a filter change.

Common: an unseated filter or an air-locked line. Remove and reseat the filter, run the water dispenser for two minutes to purge air, and give it a day. No ice after that — call us.

Related codes: F2 compressor overheat, F3 sensor fault, F7/F8 defrost & fan faults — or the full Miele fault-code index. Call (650) 658-8508 — a photo of the display by text is often enough to arrive with the right part.