Flow Temperature Sensor Fault
The flow water temperature NTC sensor has developed a fault. The boiler cannot accurately measure the outgoing water temperature.
Step-by-Step Fix Guide
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Step 1
A Gas Safe engineer will need to test the flow NTC sensor with a multimeter
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Step 2
The sensor should read approximately 12 kOhms at 20°C
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Step 3 Engineer only
The sensor may need replacing
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.