Chaffoteaux Minima MX2 24FF / 30FF Fault codes & diagnostics

5 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural GasLPG 24-30 kW 2003-2007 Discontinued
GC Number 41-980-29

Replaced by: Pigma EVO

Download the Chaffoteaux Minima MX2 24FF / 30FF manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
41-980-29 MX2 30 FF Minima 2003–2007
Just want the most common Chaffoteaux Minima MX2 24FF / 30FF faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 5 documented codes

Tap any card for details

30

Your boiler has stopped working because water is not moving around the internal system efficiently enough to prevent it from overheating.

High DIY-safe £150-£350

What to check first

  1. Check that the boiler pressure is between 1.0 and 1.5 bar on the gauge
  2. Ensure all radiator valves are fully open
  3. Check if the pump is making any unusual grinding or humming noises
  4. Try restarting the boiler using the reset button

Parts commonly replaced

  • Central heating pump
  • Main heat exchanger
  • Flow thermistor (NTC sensor)
Full explanation for 30
30 - 40

Your boiler has detected a faulty internal temperature sensor that monitors the water returning from your radiators, which prevents the system from heating effectively.

High Engineer only £90-160

Parts commonly replaced

  • Central heating return thermistor (NTC sensor)
  • Wiring loom connector
Full explanation for 30 - 40
30 - 40 - 50 - 60 - 70 - 80

Your boiler has detected that it is getting dangerously hot and has shut itself down to prevent damage or fire risk.

Emergency Engineer only £120-250

Parts commonly replaced

  • Overheat thermostat
  • Central heating pump
  • Diverter valve
  • Heat exchanger

Related codes

Full explanation for 30 - 40 - 50 - 60 - 70 - 80
60 - 70 - 80

Your boiler is failing to light the gas even though it is trying to, which means it cannot provide any heating or hot water for your home.

High DIY-safe £120-280

What to check first

  1. Check if other gas appliances in your home, like a hob, are working to ensure you have a gas supply.
  2. If you have a prepayment meter, check that you have enough credit.
  3. Press the 'Reset' button on the front control panel to see if the boiler restarts.

Parts commonly replaced

  • Ignition electrode
  • Flame sensing electrode
  • Gas valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 60 - 70 - 80
70 - 80

Your boiler has switched itself off because it has detected that the internal water temperature is getting too hot.

High DIY-safe £120-350

What to check first

  1. Check that all radiator valves are fully open to allow water to circulate.
  2. Ensure the system pressure is between 1.0 and 1.5 bar on the pressure gauge.
  3. Press the 'Reset' button to see if the fault clears.

Parts commonly replaced

  • Circulation Pump
  • Overheat Thermostat
  • Heat Exchanger

Related codes

Full explanation for 70 - 80
Status & diagnostic codes

3 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

06 Status Your boiler has detected that the temperature inside is getting very cold and has automatically fired up to prevent the internal pipes from freezing. 40 - 50 - 60 - 70 - 80 Status Your boiler has detected very cold temperatures and is running the pump and burner automatically to prevent the internal pipes from freezing. 50 - 60 - 70 - 80 Status Your boiler has detected very cold temperatures and has automatically turned on the pump to prevent the internal pipes from freezing.