38
FAULT CODE
Viessmann
Boiler Water Temperature Sensor Open Circuit
Medium Severity
Engineer Required
The main boiler water temperature sensor cable has broken or become disconnected.
Step-by-Step Fix Guide
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Step 1
Check the sensor cable connections
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Step 2 Engineer only
Call a Gas Safe engineer to test and replace the sensor lead if broken
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.