8.7 High

Chaffoteaux 8.7 Fault Code

Also written as 87 — same fault.

The Chaffoteaux 8.7 fault code means: your boiler has detected that the water temperature is too low for it to operate correctly, which usually means the water is not circulating properly or a sensor is faulty.. It appears on 3 Chaffoteaux models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Low Water Temperature
Typical repair cost £90-180 (including labour)

DIY fix possible

Check that your boiler pressure is between 1 and 1.5 bar on the gauge.Ensure all radiator valves are fully open.Restart the boiler using the reset button to see if the error clears.

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Chaffoteaux models that show the 8.7 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Chaffoteaux 8.7 fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026