10
FAULT CODE
Viessmann
DHW Outlet Temperature Sensor Short Circuit
Medium Severity
Engineer Required
The domestic hot water outlet temperature sensor has a short circuit. The boiler cannot accurately measure hot water temperature.
Step-by-Step Fix Guide
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Step 1
A Gas Safe engineer will need to test the DHW NTC sensor
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Step 2 Engineer only
The sensor or its wiring 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.