What does the Chaffoteaux 30-80 (L, M, M, L, L, M) fault code mean?

Your boiler is failing to detect the temperature of your hot water cylinder, which prevents it from heating your water correctly.

How much does it cost to fix Chaffoteaux error code 30-80 (L, M, M, L, L, M)?

Typical repair cost for the Chaffoteaux 30-80 (L, M, M, L, L, M) fault is £120-220 including labour.

Thermistor cylinder open

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Almost always a stuck diverter valve on combis.

Safety-critical — turn off, read this.

Break-even maths on monthly cover.