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The most common causes are low system pressure (re-pressurise via the filling loop), a tripped condensate trap from frozen condensate pipe, a faulty ignition lead or electrode, a PCB fault, or the gas supply being interrupted. A diagnostic visit identifies the cause in 30–60 minutes. Don't keep resetting a boiler that locks out repeatedly — it usually indicates a fault that will worsen.

Modern combi and system boilers need 1.0–1.5 bar pressure to operate. Repeated drops indicate either a leak somewhere in the system (PRV, radiator, or hidden pipework), or a perished expansion vessel that can't absorb expansion as the system heats up. A small drop once a year is normal; weekly re-pressurising is a fault that needs investigating.

Depends on the fault. PCB or pump replacement on a 12-year-old unit is generally fine and gets you several more years. But if a heat exchanger fails on a 10+ year old boiler, replacement of the whole unit usually makes more sense — the repair cost approaches replacement cost, and you reset your warranty clock. Get the RGI's honest opinion on remaining lifespan before paying for a major repair.

Most Irish RGIs offer 24-hour emergency response with a 2–4 hour arrival window for genuine emergencies — no heat in winter, no hot water, gas leak smell. Non-emergencies (intermittent fault, low priority) are typically next working day. Out-of-hours rates are typically 30–50% premium over normal hourly rate.

Yes, for first visit at minimum — the engineer needs to test, gain access to the boiler, and have you confirm the fault description. If parts need ordering, the second visit can sometimes be unattended if you leave a key with a neighbour. Always ask for the engineer's RGI ID before letting them in, and check it matches what's on rgii.ie.