F.06
FAULT CODE
Vaillant
Outside Temperature Sensor Short Circuit
Medium Severity
Engineer Required
The outdoor NTC temperature sensor has a short circuit. This prevents weather-compensated heating from working correctly.
Step-by-Step Fix Guide
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Step 1
The outdoor sensor or its wiring has developed a short circuit
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Step 2
A Gas Safe engineer will need to test the sensor with a multimeter
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Step 3 Engineer only
The sensor or wiring harness may need replacing
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.