Common problems guide

The most common Remeha Avanta 28c problems

The faults most likely to send a Remeha Avanta 28c 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
é7 High DIY-safe

Your boiler has detected that the water pressure inside the system is far too low to function safely.

What to try first

Locate the filling loop (usually two silver taps connected by a braided hose) underneath the boiler.Gradually open the taps to let mains water into the heating system until the pressure gauge reads between 1.0 and 1.5 bar.Close both taps tightly and check the display to see if the error has cleared.

Est. cost
£80-150
Parts
Pressure relief valve, Filling loop, System pressure sensor
Full guide for é7
02
é1 High Engineer

Your boiler is currently performing a necessary safety check before it attempts to ignite, but it has stalled at this initial stage.

Est. cost
£120-250
Parts
Fan, Air pressure switch, Printed Circuit Board (PCB)
Full guide for é1
03
é2 High Engineer

Your boiler is failing to light the flame, which means it cannot produce any heating or hot water for your home.

Est. cost
£150-300
Parts
Ignition electrode, Gas valve, PCB
Full guide for é2
04
é4 High Engineer

Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a build-up of unburnt gas.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, Ignition transformer
Full guide for é4
05
E01 High Engineer

Your boiler is trying to start up, but it cannot successfully light the internal flame after several attempts, so it has shut down for safety.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, Flame rectification probe
Full guide for E01
06
OT ERROR Medium Engineer

Your boiler's external temperature sensor and frost protection thermostat are sending conflicting signals to your heating controller.

Est. cost
£120-200
Parts
Outside temperature sensor, Frost thermostat, Wiring harness
Full guide for OT ERROR
Parts most often replaced

on the Remeha Avanta 28c

Pressure relief valveFilling loopSystem pressure sensorFanAir pressure switchPrinted Circuit Board (PCB)

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 28c

Related guides

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