Ideal i Mini Fault codes & diagnostics

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

Combi Natural Gas 24-30 kW 2011-2016 Discontinued

Replaced by: Logic Combi

Choose your boiler type

The i Mini range comes in 2 types

Pick the one you have. The fault codes, GC numbers and manual differ by type.

24 3 codes · 1 GC number 30 3 codes · 1 GC number
Each model has its own manual A family spans several manuals, one per model or generation. Pick your model above and its page has the manual its fault codes were read from.

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Just want the most common Ideal i Mini faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 3 documented codes

Tap any card for details

c0

Your boiler is struggling because the electricity supply feeding it has dropped below the minimum voltage required to function safely.

Medium Engineer only £100-250 Shared across the i-mini range

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring harness
Full explanation for c0
c2

Your boiler's electronic memory card is not being recognised, which prevents the system from starting up safely.

High Engineer only £150-300 Shared across the i-mini range

Parts commonly replaced

  • Boiler Chip Card (BCC)
  • Main PCB
Full explanation for c2
L1

Your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage or overheating.

High Engineer only £150-300 Shared across the i-mini range

Parts commonly replaced

  • NTC Thermistor
  • Primary Heat Exchanger
  • Pump

Related codes

Full explanation for L1