S.05
FAULT CODE
Vaillant
Status: No Heat or Hot Water Demand
Medium Severity
DIY Check Possible
The boiler is in standby with no demand for heating or hot water. This is a normal operational status, not a fault.
Step-by-Step Fix Guide
-
Step 1
Check your thermostat is calling for heat and set above room temperature
-
Step 2
Ensure the programmer or timer has heating enabled for the current time period
-
Step 3
If hot water is needed, open a hot water tap to create demand
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.