BoilerFaultCodes 4.2
Overheat Lockout
Ideal LOGIC+ COMBI2 Fault codes & diagnostics
15 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Gas 2022-present
GC Numbers 47-349-9947-387-0147-387-02
Download the Ideal LOGIC+ 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. 15 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 |
|---|---|---|
| 47-349-99 | LOGIC+ COMBI2 C24 | 2022–present |
| 47-387-01 | LOGIC+ COMBI2 C30 | 2022–present |
| 47-387-02 | LOGIC+ 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 LOGIC+ COMBI2 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 15 documented codes
Tap any card for details
4.3
Ignition Lockout
4.4
Flame On Before Gas Valve On
4.5
Low Water Pressure
4.6
Flame Loss
4.7
Fan Fault
4.8
Flow Thermistor Fault
4.9
Return Thermistor Fault
4.10
Outside Sensor Fault
4.11
No CH Operation but DHW works OK
4.12
No DHW but CH Works OK
4.13
No Display
4.14
DHW Thermistor Fault
Ignition Lockout
Boiler does not light after 5 attempts
Too Many Restarts
Restart occurs 5 times within 15 minutes
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.