Common problems guide

The most common Atag E22c problems

The faults most likely to send a Atag E22c 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.
33 documented codes
6 most common
1 DIY-safe checks
5 engineer needed

The 6 most common faults

01
HIGH High DIY-safe

Your boiler has detected too much water pressure in the system, which can put unnecessary strain on your pipes and internal components.

What to try first

Locate a radiator in your home, preferably one upstairs.Place a small container and cloth underneath the radiator bleed valve.Use a radiator key to slowly open the valve until water drips out, then close it once the pressure gauge on the boiler drops to between 1.0 and 1.5 bar.

Parts
Pressure relief valve, Pressure gauge
Full guide for HIGH
02
Block 60 High Engineer

Your boiler's internal computer settings for its power output have been lost or changed, which is preventing it from firing up correctly.

Est. cost
£100-200
Parts
Main PCB
Full guide for Block 60
03
Block 80 High Engineer

Your boiler has automatically shut down because the internal exhaust gases have become dangerously hot, and it will remain off until it cools down to a safe level.

Est. cost
£150-300
Parts
Flue gas temperature sensor, Heat exchanger, Burner assembly
Full guide for Block 80
04
Block 81 High Engineer

Your boiler has detected that a critical safety sensor responsible for monitoring exhaust gases has become disconnected, so it has safely shut itself down to prevent operation.

Est. cost
£120-220
Parts
Flue gas sensor, Wiring harness
Full guide for Block 81
05
Block 82 High Engineer

Your boiler has stopped working because a sensor that monitors its exhaust fumes is reporting a fault, so the system has shut down as a safety precaution.

Est. cost
£150-250
Parts
Flue gas sensor, Wiring harness
Full guide for Block 82
06
Block 85 High Engineer

Your boiler is temporarily pausing because it cannot detect enough water moving through the system and is attempting to clear air bubbles before it restarts.

Est. cost
£120-250
Parts
Central heating pump, Flow sensor, Automatic air vent
Full guide for Block 85
Parts most often replaced

on the Atag E22c

Pressure relief valvePressure gaugeMain PCBFlue gas temperature sensorHeat exchangerBurner assembly

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 Atag 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 33-code list for the Atag E22c

Related guides

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