BoilerFaultCodesWhat the manual says
Manufacturer manualWater pressure sensor self-test: Water pressure sensor test running, heating demands are blocked.
What causes this fault?
This occurs when the boiler performs a routine safety check to ensure the water pressure sensor is measuring accurately. It is usually a temporary phase during startup or after a refill where the system monitors for pressure stability before firing the burner. If the code persists, it often suggests the sensor is struggling to get a consistent reading or the expansion vessel is failing to regulate pressure changes.
DIY fix possible
Wait up to 15 minutes for the automated test to completeEnsure your system water pressure is within the green zone on the digital displayIf the code persists, try restarting the boiler using the power button
Avoid the next call-out bill
A cover plan would handle faults like S.97: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Related fault codes
All 71 fault codes on the ecoTEC exclusive
Seeing a different code? Every code this model can display, in one place.