305
FAULT CODE
Ariston
PCB / EEPROM Error
High Severity
Engineer Required
The printed circuit board has an internal memory error. The boiler's configuration data may be corrupted.
Step-by-Step Fix Guide
-
Step 1
Try power-cycling the boiler by switching off at the spur for 60 seconds
-
Step 2
If the error persists, the PCB may need reprogramming or replacing
-
Step 3 Engineer only
A Gas Safe engineer is required
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.