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.

The most common Euroterm faults

01

A01 High Engineer

Your boiler is trying to start up, but it is failing to light the flame safely.

Est. cost: £150-300
Parts: Ignition electrode, Gas valve, PCB

Full guide for E27 Plus A01

02

A05 High Engineer

Your boiler has stopped working because the internal fan that pushes out harmful gases is not operating correctly.

Est. cost: £150-300
Parts: Flue gas fan, Air pressure switch, Printed circuit board (PCB)

Full guide for E27 Plus A05

03

A06 High Engineer

Your boiler is trying to start up and light a flame, but it keeps failing after several attempts and has safely shut itself down.

Est. cost: £150-300
Parts: Ignition electrode, Gas valve, PCB

Full guide for E27 Plus A06

04

F10 High Engineer

Your boiler is temporarily unable to accurately measure the temperature of the water flowing through the system due to a faulty sensor.

Est. cost: £120-220
Parts: Flow NTC thermistor, Flow sensor wiring harness

Full guide for E27 Plus F10

05

F13 High Engineer

Your boiler has detected a problem with the temperature sensor attached to the main heat exchanger, which usually stops it from working safely.

Est. cost: £90-180
Parts: NTC thermistor / exchanger probe, Wiring harness

Full guide for E27 Plus F13

06

F14 High Engineer

Your boiler has temporarily stopped working because it is having trouble measuring the temperature of the water flowing through the system.

Est. cost: £120-250
Parts: Flow thermistor, NTC sensor, Wiring harness

Full guide for E27 Plus F14

07

F15 High Engineer

Your boiler has detected an issue with the internal fan, which safely removes harmful exhaust gases from your home, so it has shut down to protect you.

Est. cost: £150-300
Parts: Flue gas fan, Air pressure switch, Printed circuit board (PCB)

Full guide for E27 Plus F15

08

F34 High Engineer

Your boiler has detected that the electricity supply coming into your home has dropped too low to run safely.

Est. cost: £90-180
Parts: Main PCB, Power Supply Unit

Full guide for E27 Plus F34

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1 Euroterm boilers with full fault code lists.

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