BoilerFaultCodesChaffoteaux E 12 Fault Code
Also written as E12 — same fault.
The Chaffoteaux E 12 fault code means: your boiler has lost the ability to detect the flow of water because an internal electrical sensor is sending a faulty signal, which prevents the heating and hot water from starting safely.. It appears on 4 Chaffoteaux models in our database.
Technical description: Flow sensor short circuit
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like E 12: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Chaffoteaux models that show the E 12 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux E 12 fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.
- Chaffoteaux Minima HE manual (PDF)
- Chaffoteaux Minima HE System 24 manual (PDF)
- Chaffoteaux Minima HE System 30 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026