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

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

Combi Natural GasLPG 24-30 kW 2003-2007 Discontinued

Replaced by: Pigma EVO

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Severity at a glance

Each cell = one fault code. Hover to identify.
5 High 2 Low
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 7 documented codes

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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 water is not moving through the system properly, causing it to shut down to prevent overheating.

High DIY-safe £100-£350

What to check first

  1. Check the pressure gauge on the front of the boiler and top it up to 1.5 bar if it is low.
  2. Ensure all radiator valves are fully open and that your lockshield valves haven't been turned off.
  3. Listen for air in the system and bleed your radiators if they have cold spots.

Parts commonly replaced

  • Circulating Pump
  • Main Heat Exchanger
  • Flow Temperature Sensor

Related codes

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

Your boiler has detected very cold temperatures and is running the pump and burner automatically to prevent the internal pipes from freezing.

Low DIY-safe

What to check first

  1. Check that your electricity and gas supply are turned on
  2. Ensure your thermostat is set to a normal temperature
  3. Wait for the boiler to finish its warming cycle; the lights should stop flashing once it reaches a safe temperature
Full explanation for 40 - 50 - 60 - 70 - 80
50 - 60 - 70 - 80

Your boiler has detected very cold temperatures and has automatically turned on the pump to prevent the internal pipes from freezing.

Low DIY-safe

What to check first

  1. Ensure your main gas and electricity supplies remain switched on
  2. Check that your internal room thermostat is turned up to a normal heating temperature
  3. Wait for the boiler to complete its cycle; the lights should turn off once the water temperature rises

Related codes

Full explanation for 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