BoilerFaultCodesYour boiler is temporarily pausing to check the system's water pressure before it starts up to provide heating or hot water.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Water pressure sensor check is running, demand (DHW or heating) is blocked
What causes this fault?
This status occurs when the boiler's internal computer is verifying that there is enough water pressure and flow before it safely ignites the burner. It is often triggered if the water pressure sensor or temperature sensors are sending slightly inconsistent readings or taking too long to respond. While it is usually just a brief safety check, if it persists, it typically means a sensor is beginning to fail or there is a minor circulation issue.
DIY fix possible
Wait for up to 15 minutes to see if the code clears automaticallyCheck that the pressure gauge is between 1.0 and 1.5 barRestart the boiler using the reset button if the code remains for more than 20 minutes
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like S.97 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm Ultrapower sxi is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.