BoilerFaultCodesYour boiler has detected an issue with the air pressure or water flow sensors, preventing it from firing up for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: WPS / PPS ALARM
What causes this fault?
This fault occurs when the boiler's internal sensors detect that either the water pressure is too low or the fan isn't moving air through the system correctly. For safety reasons, the boiler will refuse to ignite if it cannot confirm that water is flowing and harmful exhaust gases are being safely vented away. The most common reasons are a leak in the central heating system causing a drop in pressure, or a physical blockage in the air tubes or flue.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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