BoilerFaultCodesYour boiler is simply showing you that it is currently busy heating up the water for your taps or shower.
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: SANITARY DEMAND
What causes this fault?
This code appears when the boiler detects that a hot water tap or shower has been turned on somewhere in your home. It isn't a fault, but rather a status message confirming that the internal flow sensor has triggered and the boiler is now prioritising heating your water. Once you turn the tap off, the code should disappear as the boiler returns to its normal standby or heating mode.
DIY fix possible
Check that your hot water taps are fully closed.Monitor the display to see if the 'P' disappears once you stop using hot water.If the 'P' remains on while no taps are running, contact a professional to check for a leaking pipe or a stuck internal valve.
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 P — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm Compact 100 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.