120
FAULT CODE
Ariston
Flow/Return Sensors Reversed
Medium Severity
Engineer Required
The sensors are fitted to the wrong pipes.
Step-by-Step Fix Guide
-
Step 1 Engineer only
A Gas Safe engineer should verify sensor positions
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.