Source-backed catalogue
Verified boiler fault-code guides
Choose a supported model and code to read the catalogue entry and its source documents.
Baxi · Assure 500 System 2
- Baxi A.00.34Outdoor temperature sensor expected but not detected.
- Baxi A.02.18OBD error.
- Baxi A.02.36Functional device disconnected.
- Baxi A.02.37Passive functional device disconnected.
- Baxi A.02.49Failed node initialisation.
- Baxi A.02.54OpenTherm bus power supply error.
- Baxi A.02.55Incorrect or missing serial number.
- Baxi A.02.76Internal memory reserved for full customisation of settings. No further changes can be made.
- Baxi H.00.42Pressure sensor open/faulty.
- Baxi H.02.02Waiting for configuration settings to be entered (CN1,CN2).
- Baxi H.02.03Configuration settings (CN1,CN2) not entered correctly.
- Baxi H.02.04PCB settings cannot be read.
- Baxi H.02.05Setting memory not compatible with the boiler PCB type.
- Baxi H.03.00No identification data for boiler safety device.
- Baxi H.03.01Communication failure in comfort circuit (internal fault in boiler PCB).
- Baxi H.03.05Power supply voltage too low.
- Baxi E.00.04Return temperature sensor disconnected.
- Baxi E.00.05Return temperature sensor short circuited.
- Baxi E.00.16DHW tank temperature sensor not connected.
- Baxi E.00.17DHW tank temperature sensor short-circuited.
- Baxi E.04.01Flow temperature sensor short circuited.
- Baxi E.04.02Flow temperature sensor disconnected.
Checking verified manufacturer coverage…