Ideal Logic fault codes
Error codes, likely faulty components, and part numbers for Ideal Logic and Logic+ model ranges.
View Ideal Logic guide →Find your boiler's fault codes by brand
Choose the manufacturer named on your boiler's badge to see the fault codes, part numbers and model ranges that apply to it. The same code can point to a different part depending on who built the boiler, and often on which model.
Browse the fault code guidesFault codes and parts by brand
Fault codes and part numbers differ across boiler brands, and often across model ranges from the same brand. Start with the make sat in front of you.
Worcester Bosch fault codes
Greenstar error codes explained, with the component each one points to and the part to check first.
View Worcester Bosch guide →Baxi 200 and 400 fault codes
Error codes for the Baxi 200 and 400 ranges, with the part usually at fault and how to confirm it.
View Baxi guide →Every brand and guide
Browse fault code guides and part articles by boiler make, model range, and component.
Browse all guides →What you can fit yourself
Check which repairs are DIY-permissible and which are restricted to a Gas Safe registered engineer.
Read the Gas Safe guide →Why the model matters as much as the fault code
A fault code on the display tells you what the boiler's control board has noticed, not which part is broken. The same three digits can point to a stuck diverter valve on one model and a faulty pressure sensor on another, even when both boilers carry the same brand name on the casing.
Why the model range changes the answer
Manufacturers revise a boiler's internals across its production life. A component gets swapped for a cheaper or more reliable equivalent, a wiring loom changes, a control board is redesigned, and the fault code table gets updated to match, often without the model name changing at all. Two boilers sitting side by side in a plant room, both badged with the same series name, can need different parts for what looks like an identical fault.
This is why a part number pulled from a general search can be wrong for your specific appliance, even when the fault code matches exactly. The serial number and the manufacture date on the boiler's data plate matter as much as the model name printed above it.
What to check before ordering a part
- The full model name as printed on the data plate.
- The serial number or manufacture date range, since parts often change mid-production
- Whether the fault code guide you're reading states the model range it applies to
- The physical part label on the failed component, where it's accessible, against any part number you're about to order
Guides organised by brand and model range exist for this reason: a fault code on an Ideal Logic behaves differently from the same digits on a Worcester Bosch Greenstar, and the part numbers rarely cross over. You can start with the brand-specific guides for Ideal Logic fault codes, Worcester Bosch Greenstar fault codes, or Baxi 200 and 400 series fault codes if your boiler matches one of those ranges.