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No heat, no hot water, a flashing code you have never seen. Most boiler callouts start exactly here — and most of the first hour is calmer than it feels.
The one-line answer: if you smell gas, leave the house and call 0800 111 999 — that comes before everything. Otherwise, read the pressure gauge, note any fault code, try one reset, and ring 020 4577 2888 to be connected with a local plumber, day or night.
Stand still and smell. If there is any smell of gas — at the boiler, at the hob, anywhere — this stops being a plumbing problem in that instant. Leave the property now, touching no light switches, no appliances, nothing with a flame, and call the National Gas Emergency Service on 0800 111 999 from outside. Do not come back in until you are told it is safe. A plumbing line is the wrong number for that call, and everything else on this page waits.
No gas smell? Good. Then nothing here is dangerous yet — it is just cold. Carry on down the clock.
Go to the boiler and collect three facts. One: the pressure gauge. Most sealed systems sit around 1 to 1.5 bar when cold — a needle well below 1 means the system has lost water, a needle up past 2.5 or 3 means too much is in there or a valve is misbehaving. Two: the display. Write down any fault code exactly as shown; the same two letters and digits that mean nothing to you tell a plumber half the story before they arrive. Three: the basics around it — has the power tripped, has a timer or smart thermostat lost its schedule, is the gas supply working elsewhere in the house?
Do not open the boiler casing. Everything behind it is for a qualified engineer, and nothing behind it will get your heating back sooner tonight.
Three moves are reasonable for a householder, each tried once. If the pressure is low, top the system up through the filling loop to around 1 to 1.5 bar, following your manual, and close the loop properly afterwards. If the boiler is locked out, press reset once and let it run its sequence. And on a frosty morning — the kind central Scotland reliably serves up — check the condensate pipe, the small plastic pipe running outside: if it has frozen, the boiler shuts itself down, and pouring warm (never boiling) water along a reachable section at ground level, then resetting, often brings everything back.
The word that matters is once. A boiler that needs resetting daily, or topping up weekly, is telling you something is wrong underneath — repeating the ritual only postpones the phone call.
Ring with your three facts: the pressure reading, the exact fault code, and what you tried. You will get an honest sense of arrival time based on workload and distance — and an honest opinion on whether this is a tonight job or a tomorrow job, because a working household with no heating in July is a different emergency from a young family with no heat in a January frost. Ask what the visit will cost before agreeing to it: call-out fee, hourly rate, likely parts.
While you wait, close doors to keep warmth in the rooms you are using, and if you have an immersion heater or electric shower, you may still have hot water by another route. Older stone houses around the town centre lose heat slowly but steadily; newer estate homes cool faster but reheat faster too. Either way, a cold evening is uncomfortable, not unsafe — the clock is on your side now.
Once running, note what failed and when — patterns sell the diagnosis next time. If the condensate pipe froze, ask about insulating or rerouting it before the next cold snap. And whoever works on the gas side of a boiler must be qualified for gas work, so it is always fair to ask whether an engineer is Gas Safe registered before that kind of work starts.
Usually yes, once. Most sealed systems are topped up through a filling loop underneath the boiler — your manual shows the exact steps for your model. Aim for roughly 1 to 1.5 bar with the system cold, and close the loop fully afterwards. If the pressure falls again within days, stop topping up and have the leak traced instead.
Repeated pressure loss means water is leaving the system somewhere — a weeping radiator valve, a small leak under a floor, or an internal fault such as the expansion vessel or pressure relief valve. Topping up hides the symptom without fixing the cause, so mention the pattern when you phone rather than quietly refilling every week.
On frosty central-Scotland mornings, the small plastic pipe that drains condensation from the boiler can freeze where it runs outside, and the boiler shuts down with a fault code. If you can reach it safely at ground level, pouring warm — never boiling — water along the frozen section and resetting the boiler often clears it. If it is out of reach, leave it for the plumber.
Stop treating it as a boiler problem. Leave the property without touching light switches or anything with a flame, and call the National Gas Emergency Service on 0800 111 999 once you are outside. A plumbing line is the wrong number for a suspected gas leak — make that call first, and only return when told it is safe.
The main page — the whole first hour on one clock, plus areas covered.
Go to home →Stopcock in the first minute — the timed plan for water everywhere.
Start the clock →One plughole or the whole house — how to tell, and what to try.
Start the clock →Honest ballparks and the questions to ask before work starts.
Read the guide →Pressure, timer, tripped switch — the safe checks before you call.
Start the clock →Gentle heat from the tap end — and the lagging that stops the next one.
Start the clock →Damp patches and dropping pressure — the honest stopcock test.
Start the clock →Ring any hour with the pressure reading and the code, and be connected with a local plumber covering Dunfermline and west Fife.
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