AL 31
FAULT CODE
Sime
Communication Fault (Alarm 31)
High Severity
Engineer Required
Internal communication error between boiler components.
Step-by-Step Fix Guide
-
Step 1 Engineer only
A Gas Safe engineer should check wiring
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.