0 pressure on boiler but no visible filling loop to fill boiler?

The filling loop could possibly be underneath the boiler or I'm the airing cupboard with the hot water cylinder. But it's better to get someone out to have a look in person.

Hi If your boiler is showing 0 pressure and there’s no visible filling loop, here are a few things to check: 1. Look beneath the boiler – the filling loop is often a flexible silver braided hose connected between two valves, usually under the boiler or nearby. 2. If there’s no hose attached, you might need to connect a detachable filling loop, which is common in some systems (especially if installed to comply with regs). It may be stored in a cupboard nearby. 3. On some modern boilers, the filling mechanism is built-in and hidden behind a panel – check your boiler manual or look online using your exact boiler model. 4. If you’re unsure or can’t locate it, it’s best to get a qualified Gas Safe engineer to check – overfilling or incorrect pressurisation can damage the system. Let me know your boiler make/model and I can guide you more specifically. Best regards, Misha

Depending on the make and model of your boiler, some of them have an integral filling loop which is either a key or a switch rather then your traditional filling loop with a flexible hose. If you are struggling to locate your filling loop please contact a local gas engineer to take a look at this for you. If you do manage to locate the loop, remember not to overfill the pressure as this may cause damage to components in your boiler or heating system.