D1
FAULT CODE
Ferroli
Diverter Valve Fault
Medium Severity
Engineer Required
The diverter valve (which switches water flow between heating and hot water) appears to not be operating correctly.
Step-by-Step Fix Guide
-
Step 1 Engineer only
This almost always requires a Gas Safe engineer to inspect and replace the diverter valve
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.