BoilerFaultCodes dU
Diverter Valve in midposition
Ideal INDEPENDENT COMBI2 Fault codes & diagnostics
29 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Gas 2022-present
GC Numbers 47-387-1047-387-11
Download the Ideal INDEPENDENT COMBI2 manual
PDF
Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 29 Unrated
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 |
|---|---|---|
| 47-387-10 | INDEPENDENT COMBI2 C30 | 2022–present |
| 47-387-11 | INDEPENDENT COMBI2 C35 | 2022–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Ideal INDEPENDENT COMBI2 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 29 documented codes
Tap any card for details
F 0C
DHW Thermistor Fault
F 0t
Room Thermostat Fault: Check Room Stat & connections
F 02
Flame Loss
F 03
Fan Fault
F 04
Flow Thermistor Fault
F 04 or L 04
Flow Thermistor Fault
F 05
Return Thermistor Fault
F 05 or L 05
Return Thermistor Fault
F 06
Outside Sensor Fault
Showing 11–20 of 29
F 07
Low Mains Voltage: Contact Electricity Provider
F 09
PCB Fault: Replace PCB
F 10
Spark Generator Fault: Check wiring, if OK replace spark generator
F 12
Pump Rotor Blocked: Clear blockage
F 13
Pump Fault: Check pump wiring, if OK replace pump
F 14
High Mains Voltage: Contact electricity provider
F 15
Pump Fault: Check pump wiring, if OK replace pump
F 16
Gas Valve Fault: Check gas valve wiring, if OK replace gas valve
F 17
Pump Fault: Check pump wiring, if OK replace pump
F0U
Go to Section 4.14: Flow/Return Differential greater than 50°C
Showing 21–29 of 29
F01
Boiler has a fault for a specific error. Display will show a number after the “F” to indicate which error is detected.
L 0C
Restart lockout after 5 failed restart attempts within 15 minutes
L 0d
Go to Section 4.3: Ignition Lockout: Blocked Flue/Condensate
L 02
Ignition Lockout
L 04
Flow Thermistor Fault
L 05
Return Thermistor Fault
L 06
Flame On Before Gas Valve On
L01
Boiler is in Lockout for a specific error. Display will show a number after the “L” to indicate which error is detected
L2
Ignition lockout after 5 failed attempts
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