Pyrolytic self-cleaning leaves heavy residues; oven does not seem to reach full cleaning temperature, but no error code is shown.

Safety first: Ensure the oven is empty of accessories not rated for pyrolysis and that the door is closed firmly.

Step-by-step checks:

• Use full pyro cycle: Select the longest, highest-intensity pyrolytic program recommended by V-ZUG.
• Check door seal and hinges: Replace a damaged gasket and adjust hinges so the door closes tightly.
• Pre-clean: Remove thick layers of food residue manually before running pyrolysis to improve results.

When to call a technician: If performance remains poor, a technician should verify pyrolytic temperature with service tools and check sensors and safety thermostats.