Miele Oven F23: Pyrolysis Didn't Reach Temperature

F23 logs when the self-clean (pyrolysis) program can’t drive the cavity to its target temperature in the allotted time. Pyrolysis runs the oven far hotter than any cooking mode — it’s the most demanding thing an H 7000 ever does, which is why marginal components fail there first while dinner still cooks fine.

The causes, in field order

1. Heavy soil load. Sounds trivial; isn’t. Thick grease deposits absorb enormous heat while burning off. Miele’s own guidance: remove large residue before pyrolysis. An F23 on a badly soiled cavity with an otherwise healthy oven is common.
2. Door seal past its prime. Pyrolysis magnifies any seal leak; heat bleeds, target unreachable. Check the gasket for compressed, torn or hardened sections.
3. Weak heating circuit. An element (or its relay path) delivering less than rated power cooks food acceptably but can’t summit pyrolysis temperature. This is the version that needs us.
4. Temperature-sensing drift — related territory to F31.

What to do

Cool-down, remove heavy residue and anything left in the cavity (racks per manual), inspect the gasket visually, and run pyrolysis once more. Second F23 → stop repeating it; each attempt is hours at extreme temperature for no gain. We measure element draw and sensor response against spec, and check the door-seal system properly.

FAQ

Cooking works perfectly — how can heating be weak?

Cooking asks for a fraction of pyrolysis power. Self-clean is the stress test; it finds weakness first.

Is it OK to just stop using self-clean?

You can, but F23’s cause doesn’t age well — a weakening element or seal eventually shows up at Thanksgiving instead.

The oven smells strongly during pyrolysis — related?

Strong smoke means heavy soil burning, the same thing that causes cause #1. Ventilate and reduce soil next time.