Maxol Supacombi HE 24 Fault codes & diagnostics

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

Combi Natural Gas 24 kW 2007 onwards Discontinued
GC Number 47-260-11
Download the Maxol Supacombi HE 24 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 →

Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 12 High 1 Medium
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
47-260-11 Supacombi HE 24 2007–present
Just want the most common Maxol Supacombi HE 24 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 14 documented codes

Tap any card for details

(No display)

Your boiler appears to have no power and the control panel is completely blank, meaning it cannot start the ignition process.

High DIY-safe £90-280

What to check first

  1. Check if other appliances are working to rule out a general power cut
  2. Ensure the boiler's fused spur switch (usually near the boiler) is turned ON
  3. Check your home's main consumer unit (fuse box) to see if a circuit breaker has tripped
  4. Replace the fuse in the boiler's external switch with a new 3-amp fuse

Parts commonly replaced

  • Internal PCB fuse
  • Main Printed Circuit Board (PCB)
  • External Fused Spur
Full explanation for (No display)
1

Your boiler has become too hot and has automatically shut down to prevent damage to the internal components.

High DIY-safe £90-180

What to check first

  1. Wait for the boiler to cool down for at least 20 minutes.
  2. Check that all radiator valves are fully open and there are no obstructions to water flow.
  3. Press the 'Reset' button on the control panel to clear the lockout.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Temperature NTC Sensor

Related codes

Full explanation for 1
4

Your boiler has failed to light after several attempts and has locked itself out for safety.

High DIY-safe £100-£250

What to check first

  1. Check that your gas supply is turned on at the meter
  2. If you have a prepaid gas meter, ensure it has credit
  3. Press the reset button on the control panel to attempt a restart

Parts commonly replaced

  • Ignition electrode
  • Flame sensing probe
  • Gas valve
  • Ignition lead
Full explanation for 4
5

Your boiler started to heat up but the flame went out unexpectedly, causing the system to shut down for safety.

High DIY-safe £120-280

What to check first

  1. Check that your gas emergency control valve is open and you have credit on your gas meter
  2. Check if other gas appliances, like a hob, are working to confirm gas supply
  3. Press the reset button to see if the boiler restarts

Parts commonly replaced

  • Flame sensing electrode
  • Gas valve
  • Ignition lead

Related codes

Full explanation for 5
6

Your boiler has shut down because the internal water temperature has become too hot.

High DIY-safe £120-350

What to check first

  1. Ensure all radiator valves are fully open to allow water to flow.
  2. Check that the boiler pressure gauge is between 1 and 1.5 bar; top up if low.
  3. Press the Reset button once the boiler has cooled down for 20 minutes.

Parts commonly replaced

  • Circulating Pump
  • Overheat Thermostat
  • Main Heat Exchanger (Cleaning/Descaling)

Related codes

Full explanation for 6
7

Your boiler has switched itself off because the internal exhaust gases have reached a dangerously high temperature.

Emergency Engineer only £150-450

Parts commonly replaced

  • Main Heat Exchanger
  • Flue NTC Sensor
  • Burner Insulation

Related codes

Full explanation for 7
12

Your boiler has stopped providing heating and hot water because a internal sensor that monitors temperature has stopped working correctly.

High Engineer only £90-160

Parts commonly replaced

  • Central Heating (CH) Thermistor
  • NTC Sensor

Related codes

Full explanation for 12
13

Your boiler has stopped working because a safety sensor in the exhaust pipe has detected a problem or failed.

High Engineer only £120-220

Parts commonly replaced

  • Flue thermistor (NTC sensor)
  • Wiring harness
  • Main PCB

Related codes

Full explanation for 13
14

Your boiler has stopped producing hot water because a internal sensor that monitors water temperature has stopped working correctly.

Medium Engineer only £90-160

Parts commonly replaced

  • DHW Thermistor (NTC Sensor)
  • Sensor wiring harness

Related codes

Full explanation for 14
20

Your boiler is unable to light the burner because the gas is not being successfully released into the unit.

High Engineer only £180-350

Parts commonly replaced

  • Gas Valve
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 20
24

Your boiler has stopped working because it cannot confirm that harmful exhaust fumes are being safely cleared away, so the fan is running constantly as a safety precaution.

High Engineer only £120-£280

Parts commonly replaced

  • Air Pressure Switch
  • Venturi tube
  • Fan assembly
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 24
32

Your boiler has failed to ignite because the electrical power supply to the internal components has been interrupted or failed.

High Engineer only £120-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring Harness
  • Ignition Transformer

Related codes

Full explanation for 32
41

Your boiler has stopped working because the water pressure is too low for the system to run safely.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (usually a silver flexible hose) under the boiler.
  2. Open the one or two taps on the hose slowly to let water into the system.
  3. Watch the pressure gauge until it reaches between 1 and 1.5 bar, then close the taps fully.
  4. Press the reset button on the boiler control panel.

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for 41