Fault codes for boilers by brand and model

The code on the display indicates what the boiler has detected, but its meaning varies depending on the brand and model. Choose your brand or enter the code to see what it means, what you can check without opening the boiler, and the manual for your model.

Explore the blogBoilers by brand and topic, air conditioning and aerothermal energy

Boiler fault codes and issues

72 guides · Page 4 of 8

View all guides

Frequently asked questions: fault codes

What does a fault code in the boiler mean?

It is the warning with which the PCB indicates what it has detected: low pressure, ignition failure, overheating, or a non-responsive sensor. The same code can mean different things depending on the brand and generation of the model, which is why it should be consulted in your model's guide.

Can I reset the boiler if an error appears?

Once, yes: the reset works if the fault was temporary. If the fault code returns, the boiler is protecting itself; restarting it over and over does not fix it and may worsen the fault.

What should I check before calling the technician?

The circuit pressure (between 1 and 1.5 bar with the boiler cold), that the gas valve is open, that there is power, and that the thermostat is calling for heat. Note the complete code, with letters and zeros, and the exact model of the rating plate.

Does the code indicate which spare part needs to be replaced?

Not always. Guide towards an area (ignition, circulation, sensors, or PCB), but the faulty part is confirmed by measuring. Buying a spare part solely based on the code may not resolve the fault.

Do you need to check the equipment?

Repair, maintenance, and installation in Madrid.

Explore the blog