Common problems guide

The most common Euroterm boiler problems

The faults we see most often across the Euroterm range — with plain-English causes, what to check first, estimated repair costs, and whether it's a DIY job or needs a Gas Safe engineer. Based on fault-code data across 1 Euroterm boiler models.

38 unique codes
1 models covered
5 DIY-safe (top 8)
8 engineer needed

The most common Euroterm faults

01
A01 High DIY-safe

Your boiler has tried to start up but cannot light the flame, which means your heating and hot water will not work.

What to try first

Check if other gas appliances in your home, like a hob, are working to ensure you have a gas supply.If you have a prepaid gas meter, check that you have sufficient credit.Press and hold the reset button for several seconds to try and restart the boiler.

Est. cost
£100-£350
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for E27 Plus A01
02
A03 High DIY-safe

Your boiler has become too hot and has shut itself down as a safety precaution to prevent internal damage.

What to try first

Wait for the boiler to cool down for at least 30 minutesCheck that all radiator valves are fully openCheck the boiler pressure gauge and top up to 1.5 bar if it is lowPress the Reset button on the control panel

Est. cost
£120-300
Parts
Circulation Pump, Overheat Thermostat, Main Heat Exchanger (Descaling)
Full guide for E27 Plus A03
03
A06 High DIY-safe

Your boiler is trying to start up but cannot successfully light the gas to produce a flame.

What to try first

Check that your gas supply is turned on at the meterIf you have a prepayment meter, ensure you have credit availableCheck if other gas appliances, like a cooker, are working correctlyReset the boiler by following the instructions in your user manual

Est. cost
£120-350
Parts
Ignition electrode, Flame sensing probe, Gas valve
Full guide for E27 Plus A06
04
A23 High DIY-safe

Your boiler has failed to fill with enough water pressure within the required time, usually because the system is low on water or there is a leak.

What to try first

Check the pressure gauge on the front of the boiler; it should ideally be between 1.0 and 1.5 bar.Locate the filling loop (the flexible silver hose usually underneath the boiler) and open the valves to top up the water pressure.Close the valves tightly once the gauge reaches 1.5 bar and press the reset button.

Est. cost
£60-180
Parts
Filling loop, Water pressure sensor, Expansion vessel
Full guide for E27 Plus A23
05
F37 High DIY-safe

Your boiler has switched itself off because the water pressure in the system is too low for it to operate safely.

What to try first

Locate the filling loop (usually a silver flexible hose) underneath the boiler.Open the one or two taps on the loop slowly until you hear water moving.Watch the pressure gauge until it reaches between 1.0 and 1.5 bar, then close the taps tightly.

Est. cost
£0-120
Parts
Filling loop, Pressure sensor, Pressure gauge
Full guide for E27 Plus F37
06
A02 High Engineer

Your boiler is detecting a flame even though the burner should be switched off, which is a safety conflict causing the system to lock out.

Est. cost
£120-280
Parts
Ionisation electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for E27 Plus A02
07
F04 High Engineer

Your boiler has shut down because a sensor has detected that the exhaust gases are not venting safely or the sensor itself has failed.

Est. cost
£120-220
Parts
Flue thermostat (NTC sensor), Wiring harness, Heat exchanger (if scaled/blocked)
Full guide for E27 Plus F04
08
F05 High Engineer

Your boiler has detected an issue with the fan that clears away waste gases, causing the system to shut down for safety.

Est. cost
£180-£350
Parts
Fan assembly, Air pressure switch, PCB (Control board)
Full guide for E27 Plus F05

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