Common problems guide

The most common Chaffoteaux Minima HE System 24 problems

The faults most likely to send a Chaffoteaux Minima HE System 24 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.
37 documented codes
6 most common
3 DIY-safe checks
3 engineer needed

The 6 most common faults

01
E02 High DIY-safe

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

What to try first

Locate the filling loop underneath your boiler or near the hot water cylinder.Open the valves slowly to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valves firmly and press the reset button on your boiler.

Parts
Pressure relief valve, Pressure sensor, Automatic air vent
Full guide for E02
02
E 02 High DIY-safe

Your boiler has temporarily stopped working because it cannot circulate water through the system properly, usually due to low water pressure.

What to try first

Check the pressure gauge on the front of your boiler to see if it has dropped below 1 bar.Use the filling loop underneath the boiler to top the system pressure back up to around 1 to 1.5 bars.Reset the boiler using the reset button to clear the fault code.

Est. cost
£90-250
Parts
Circulating Pump, Automatic Air Vent, Pressure Relief Valve
Full guide for E 02
03
E 08 High DIY-safe

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

What to try first

Locate the external filling loop, which is a flexible braided hose with one or sometimes two valves connecting your mains water supply to your heating pipes.Open the filling valve(s) slowly to allow water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close the valve(s) tightly to stop the flow and ensure the loop is disconnected if it is a temporary hose type.

Est. cost
£80-150
Parts
Pressure relief valve, Pressure sensor, Expansion vessel
Full guide for E 08
04
E04 High Engineer

Your boiler is trying to start up, but it is failing to detect a flame so it shuts itself down for safety.

Est. cost
£150-300
Parts
Ignition lead, Ignition/ionization electrode, Gas valve
Full guide for E04
05
A03 High Engineer

Your boiler has failed to light because it cannot detect a flame after multiple attempts, meaning you currently have no heating or hot water.

Est. cost
£150-300
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for A03
06
A 01 High Engineer

Your boiler has detected that parts inside the unit are becoming dangerously hot and has shut itself down to prevent damage.

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

on the Chaffoteaux Minima HE System 24

Pressure relief valvePressure sensorAutomatic air ventCirculating PumpAutomatic Air VentPressure 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 37-code list for the Chaffoteaux Minima HE System 24

Related guides

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