Atag E Range Fault codes & diagnostics

15 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

CombiSystem Natural Gas 24-38 kW 2013-2018 Discontinued
GC Numbers 41-310-1241-310-1347-310-1347-310-14

Replaced by: iC Series

Download the Atag E Range manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Severity at a glance

Each cell = one fault code. Hover to identify.
13 High 2 Medium

All 15 documented codes

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Block 60

Your boiler’s internal computer has lost its correct settings for how much power it should be using, causing it to stop运行 to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Control PCB
  • Gas Valve
Block 67

Your boiler has detected an unusual temperature difference while it is supposed to be switched off, and it is pausing its operations until the system temperatures balance out.

Medium Engineer only £120-250

Parts commonly replaced

  • Flow/Return Temperature Sensor
  • Central Heating Pump
Block 80

Your boiler has detected that the exhaust gases are becoming dangerously hot and has shut itself down to prevent internal damage.

High Engineer only £150-350

Parts commonly replaced

  • Heat exchanger
  • Flue gas temperature sensor
  • Burner assembly

Related codes

Block 81

Your boiler has stopped working because it cannot detect a safety component that monitors exhaust fumes, which prevents it from firing up.

High Engineer only £120-250

Parts commonly replaced

  • Flue gas sensor
  • Wiring harness
  • PCB

Related codes

Block 82

Your boiler has detected an electrical fault in its safety monitoring system and has automatically shut down to keep you safe.

High Engineer only £150-250

Parts commonly replaced

  • Flue gas sensor
  • Wiring harness

Related codes

Block 85

Your boiler is struggling to detect the water flowing through it, so it has paused operation to run an automatic air-removal process to clear any trapped bubbles.

High Engineer only £120-250

Parts commonly replaced

  • Flow sensor
  • Circulating pump

Related codes

Block 86

Your boiler has detected that the electricity supply coming into your home is unstable or fluctuating outside of normal limits.

Medium Engineer only

Parts commonly replaced

  • Control PCB
  • Power supply surge protection fuse

Related codes

Error 00

Your boiler is failing to light the internal burner correctly, meaning it cannot produce heat or hot water.

High Engineer only £150-350

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Flame rectification probe
Error 01

Your boiler has detected an electrical fault in its internal control circuit, which has caused it to shut down to prevent further damage.

High Engineer only £150-300

Parts commonly replaced

  • Control PCB
  • Wiring harness
  • External pump or diverter valve

Related codes

Error 02

Your boiler is failing to light the internal flame needed to produce heat or hot water.

High Engineer only £150-350

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Ignition lead
Error 04

Your boiler has detected an unstable power supply or a sudden electrical disruption, causing it to shut down for safety reasons.

High Engineer only £120-250

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness
Error 05

Your boiler's main computer brain is experiencing a critical error and can no longer safely operate the heating system.

High Engineer only £250-450

Parts commonly replaced

  • Control Unit/PCB
Error 12

Your boiler has stopped working because an internal safety fuse responsible for the control power has blown, preventing the system from starting.

High Engineer only £120-220

Parts commonly replaced

  • 3AT internal fuse
  • Control PCB

Related codes

Error 19

Your boiler has detected that the water returning to it is far too hot, causing it to shut down to prevent damage to the system.

High Engineer only £150-350

Parts commonly replaced

  • Return temperature sensor
  • Central heating pump
  • Plate heat exchanger

Related codes

Error 28

Your boiler has switched itself off because it cannot detect that the internal fan, which is essential for clearing exhaust gases, is spinning correctly.

High Engineer only £200-350

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • Printed Circuit Board (PCB)