Common problems guide

The most common Chaffoteaux Minima HE problems

The faults most likely to send a Chaffoteaux Minima HE into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
40 documented codes
6 most common
3 DIY-safe checks
3 engineer needed

The 6 most common faults

01
E 02 High DIY-safe

Your boiler has stopped working because the water pressure inside the heating system has dropped too low.

What to try first

Locate the external filling loop, usually a silver flexible hose connected to two valves beneath the boiler.Open the valves slowly to allow mains water to enter the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both valves firmly and ensure no water is leaking from the connection points.

Est. cost
£0-£80
Parts
Filling loop, Pressure sensor
Full guide for E 02
02
E 07 High DIY-safe

Your boiler is struggling because water is not flowing around your heating system properly to distribute warmth.

What to try first

Check your boiler pressure gauge to ensure it is between 1 and 1.5 barIf the pressure is low, locate the filling loop and add water until it reaches the correct rangeOnce pressure is corrected, restart the boiler by holding the reset button

Est. cost
£120-250
Parts
Central heating pump, Flow sensor, Plate heat exchanger
Full guide for E 07
03
E 08 High DIY-safe

Your boiler has detected that the water pressure inside the heating system is too low to operate safely.

What to try first

Locate the filling loop, which is usually a silver braided hose under the boiler connected to two valves.Open the valves slowly to allow water to enter the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valves firmly and check to ensure the pressure is stable.

Est. cost
£80-150
Parts
Filling loop, Pressure sensor, Pressure relief valve
Full guide for E 08
04
E 04 High Engineer

Your boiler is failing to light the flame needed to heat your home's water, so it has stopped working for safety reasons.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, Ionisation probe
Full guide for E 04
05
A 03 High Engineer

Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a gas buildup.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, PCB
Full guide for A 03
06
A 01 High Engineer

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.

Est. cost
£120-250
Parts
NTC sensor, Primary heat exchanger, Pump
Full guide for A 01
Parts most often replaced

on the Chaffoteaux Minima HE

Filling loopPressure sensorCentral heating pumpFlow sensorPlate heat exchangerPressure relief valve

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Chaffoteaux shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue
See the full 40-code list for the Chaffoteaux Minima HE

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →