Ideal Independent Fault codes & diagnostics

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

Combi Natural Gas 24-30 kW 2011-2016 Discontinued
GC Numbers 47-348-8547-348-8647-348-87

Replaced by: Logic

Download the Ideal Independent 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.
1 Emergency 15 High 1 Medium 1 Low

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-348-85 Independent + C24 2011–2016
47-348-86 Independent + C30 2011–2016
47-348-87 Independent + C35 2011–2016

All 18 documented codes

Tap any card for details

5 Boiler Resets in 15 minutes

Your boiler has shut itself down five times in a short period, which means the safety system is repeatedly blocking it from running to prevent potential damage or a safety hazard.

High Engineer only £150-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Ignition Electrode
  • Gas Valve
  • Flame Sensor

Related codes

82

Your boiler is struggling because the electricity supply coming from your wall socket is too weak or unstable to run it correctly.

High Engineer only £100-250

Parts commonly replaced

  • External fuse spur
  • Printed Circuit Board (PCB)
  • Wiring loom

Related codes

BCC Activation Fault

Your boiler's internal computer is struggling to communicate with a secondary plug-in component, preventing the system from starting safely.

High Engineer only £150-300

Parts commonly replaced

  • Boiler Control Card (BCC)
  • Wiring harness

Related codes

BCC Fault

Your boiler is experiencing a communication error with its internal computer, meaning it cannot properly read its own programming and has safely shut down to prevent incorrect operation.

High Engineer only £150-300

Parts commonly replaced

  • Boiler Control Card
  • Wiring harness

Related codes

Boiler Type Card Fault

Your boiler has lost the digital instructions telling it how to function, which prevents it from starting up correctly.

High Engineer only £150-250

Parts commonly replaced

  • Boiler Interface Card
  • PCB

Related codes

c0

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

High Engineer only £150-300

Parts commonly replaced

  • BCC (Boiler Configuration Card)
  • Main PCB

Related codes

c2

Your boiler's computer memory card is not being recognised, meaning the system cannot run its operating programme.

High Engineer only £150-250

Parts commonly replaced

  • Boiler Chip Card (BCC)
  • Main PCB

Related codes

False Flame Lockout

Your boiler has detected a flame when it shouldn't be burning, so it has safely shut itself off to prevent a potential hazard.

Emergency Engineer only £150-300

Parts commonly replaced

  • Flame rectification probe
  • Gas valve
  • Printed Circuit Board (PCB)
Fan Fault

Your boiler has stopped working because it cannot properly circulate the air it needs for safe combustion.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Wiring harness
  • Printed Circuit Board

Related codes

Flame Loss

Your boiler has detected that the flame inside has gone out unexpectedly and it cannot stay alight, so it has safely shut itself down to prevent gas from building up.

High Engineer only £150-350

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Condensate trap
  • Flame rectification probe

Related codes

Flow Thermistor

Your boiler's temperature sensor is providing faulty readings, causing the system to stop operating as it cannot safely monitor how hot the water is getting.

High Engineer only £120-220

Parts commonly replaced

  • Flow NTC Thermistor
  • Wiring harness

Related codes

L1

Your boiler has detected that the water inside it has become dangerously hot or is not circulating correctly, so it has shut down to protect itself.

High Engineer only £120-250

Parts commonly replaced

  • Pump
  • Diverter Valve
  • NTC Sensor

Related codes

L2

Your boiler has stopped working because it cannot light its internal flame, which is often caused by a frozen or blocked pipe that drains away waste water.

High Engineer only £120-250

Parts commonly replaced

  • Condensate trap
  • Ignition electrode
  • Gas valve

Related codes

Low Mains Voltage

Your boiler is struggling because the electricity supply coming into your home is weaker than the level required to operate the unit safely.

Medium Engineer only £120-250

Parts commonly replaced

  • PCB
  • Wiring harness
Low Water Pressure

Your boiler has stopped working because the amount of water inside the system has dropped below the required level.

High DIY-safe £80-120

What to check first

  1. Locate the filling loop, which is usually a small silver braided hose or a built-in lever underneath the boiler.
  2. Slowly open the valve to let water enter the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.
  3. Close the valve tightly and check that the error code has cleared.

Parts commonly replaced

  • Pressure relief valve
  • Pressure gauge
  • Expansion vessel

Related codes

Outside Sensor Failure

Your boiler is struggling to detect the outdoor temperature, so it is running on a default setting instead of adjusting automatically to the weather.

Low Engineer only £120-200

Parts commonly replaced

  • Outside temperature sensor
  • Wiring loom/connection
Return Thermistor

Your boiler's sensor is having trouble reading the temperature of the water returning to the unit, so it has stopped working to prevent potential overheating.

High Engineer only £120-200

Parts commonly replaced

  • Return NTC Thermistor
  • Wiring harness

Related codes

Unconfigured PCB

The computer brain of your boiler has not been told which specific model it is installed in, so it cannot safely start the system.

High Engineer only £120-200

Parts commonly replaced

  • Electronic Control Board (PCB)