Common problems guide

The most common Remeha Avanta Plus 24s System problems

The faults most likely to send a Remeha Avanta Plus 24s System 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.
22 documented codes
6 most common
1 DIY-safe checks
5 engineer needed

The 6 most common faults

01
é4 High DIY-safe

Your boiler has tried to light itself several times but has failed, likely because there is no gas supply or the ignition part is dirty or broken.

What to try first

Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the property.If you have a prepayment meter, check that you have remaining credit and the valve is open.Press the Reset button on the boiler control panel for one to two seconds.

Est. cost
£100-280
Parts
Ignition electrode, Gas valve, PCB (Printed Circuit Board)
Full guide for é4
02
9 High Engineer

Your boiler has temporarily stopped working because a safety device wired into the system, such as a room thermostat or external timer, is signaling that something needs attention.

Est. cost
£90-180
Parts
External Thermostat, Wiring Centre, Time Clock
Full guide for 9
03
é0 High Engineer

Your boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately monitor the water temperature and has shut down as a safety precaution.

Est. cost
£120-£220
Parts
Flow temperature NTC sensor, Return temperature NTC sensor, Wiring harness
Full guide for é0
04
é3 High Engineer

Your boiler has detected an internal electrical safety fault or a problem with how it is grounded, causing it to shut down to prevent damage.

Est. cost
£150-350
Parts
Control unit (PCB), Wiring harness, Ignition lead
Full guide for é3
05
é5 High Engineer

Your boiler is failing to light the flame or keep it running, which means it cannot provide you with heating or hot water.

Est. cost
£150-300
Parts
Ignition electrode, Gas valve, Ionisation probe
Full guide for é5
06
é8 High Engineer

Your boiler has detected that the internal fan responsible for venting exhaust gases safely is either not spinning or communicating properly, so it has shut down to keep your home safe.

Est. cost
£180-350
Parts
Fan assembly, Wiring harness, Printed Circuit Board (PCB)
Full guide for é8
Parts most often replaced

on the Remeha Avanta Plus 24s System

Ignition electrodeGas valvePCB (Printed Circuit Board)External ThermostatWiring CentreTime Clock

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 Remeha 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 22-code list for the Remeha Avanta Plus 24s System

Related guides

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