Common problems guide

The most common Ariston Challenger 80E problems

The faults most likely to send a Ariston Challenger 80E into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
12 documented codes
6 most common
2 DIY-safe checks
4 engineer needed

The 6 most common faults

01
1 03 High DIY-safe

Your boiler has detected that water is not flowing through the system correctly, which is preventing it from heating your home properly.

What to try first

Check that all radiator valves throughout your home are fully open.Inspect the boiler pressure gauge and top it up to 1.5 bar using the filling loop if it is below 1.Reset the boiler using the reset button on the control panel.

Est. cost
£120-250
Parts
Central heating pump, Pressure sensor, Diverter valve
Full guide for 1 03
02
1 09 High DIY-safe

Your boiler has detected that the water pressure inside the system is dangerously high, which can cause internal leaks or safety valve discharge.

What to try first

Check that the filling loop valves are fully closedBleed water from a radiator using a bleed key to reduce pressureMonitor the pressure gauge to ensure it returns to between 1 and 1.5 barReset the boiler once the pressure is stabilised

Est. cost
£90-160
Parts
Pressure relief valve, Expansion vessel, Filling loop
Full guide for 1 09
03
1 01 High Engineer

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to its internal parts.

Est. cost
£120-250
Parts
NTC temperature sensor, Primary heat exchanger, Circulation pump
Full guide for 1 01
04
1 04 High Engineer

Your boiler is struggling to pump water around your heating system, which is keeping it from warming up your radiators or taps.

Est. cost
£120-250
Parts
Circulation pump, System filter, Heat exchanger
Full guide for 1 04
05
1 10 High Engineer

Your boiler has lost the ability to measure the temperature of the water circulating through your radiators, so it has turned itself off as a precaution.

Est. cost
£120-200
Parts
Central Heating (CH) flow temperature sensor/NTC probe, Wiring harness
Full guide for 1 10
06
1 18 High Engineer

Your boiler is struggling to accurately monitor the temperature of the water circulating through your radiators, so it has stopped working as a safety precaution.

Est. cost
£120-220
Parts
Central heating flow NTC sensor, Wiring harness
Full guide for 1 18
Parts most often replaced

on the Ariston Challenger 80E

Central heating pumpPressure sensorDiverter valvePressure relief valveExpansion vesselFilling loop

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Ariston shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue
See the full 12-code list for the Ariston Challenger 80E

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →