Vaillant F23 Error: Flow and Return Sensor Fault Explained
The Vaillant F23 error is a common boiler fault code that occurs when there’s a significant temperature difference between the flow and return pipes in your heating system.
The Vaillant F23 error is a common boiler fault code that occurs when there’s a significant temperature difference between the flow and return pipes in your heating system.
Amout of credit
£0.00
Monthly
£0.00
Total payable
£0.00
Interest (fixed)
£0.00
APR
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