Can I repressurise the boiler myself?

Only if you have done it before and know where the filling loop is. Topping up to between one and one and a half bar when the system is cold is routine, but overfilling or leaving the loop open causes other problems, and a system that keeps losing pressure has a leak or a failing expansion vessel that needs finding. Tell us the reading when you call and we will say whether it is safe to try.

Why does the boiler stop working in cold weather?

A frozen condensate pipe is the most common reason in Manchester. It is the white plastic pipe running outside from the boiler, and when it freezes the boiler locks out with a condensate fault code. Tell us the code when you call; it is a quick thing for us to deal with, and we will say if there is something safe you can do in the meantime.

Is no hot water an emergency?

Usually not. In summer, or in a house where everyone is fit and well, it is planned work and costs less booked in daylight. It becomes urgent when there is no heating in cold weather, or when someone elderly, very young or unwell is in the house. In those cases use the emergency line and say so; we treat it as a priority.

Boiler has no hot water? Safe checks

Key takeaways

Work out whether heating has failed too; it points us to the cause.
Note the error code exactly and the pressure reading before you call.
Check the programmer, the thermostat and the fused spur beside the boiler first.
Never remove the boiler casing or reset it more than once.
If you smell gas, leave the property and ring 0800 111 999 before anyone else.

Losing hot water is inconvenient rather than dangerous, most of the time. But a boiler is a gas appliance, and the line between a harmless check and an unsafe one is not always obvious from the outside. This guide is deliberately conservative. We would rather you called us for something we could have talked you through than opened a casing you should not have.

The safe checks you can make

Start by working out what has actually failed. If the radiators still heat but the taps run cold, the problem is on the hot water side only, which points us in one direction. If both have gone, it is more likely the boiler itself has locked out or lost power. Tell us which when you call; it shortens the diagnosis.

Look at the boiler display without touching anything else. Most modern boilers show an error code when they lock out. Write it down exactly, including any letters. A pressure gauge on the front should normally sit between one and one and a half bar when the system is cold. If it is at zero, or well above two, note that too. Do not try to repressurise the system yourself unless you have done it before and know where the filling loop is; we can talk you through whether it is safe when you call, or do it ourselves.

Check the obvious things around the boiler. Is the programmer or timer set to a period when hot water is on? Has a smart thermostat lost its connection? Is the switched fused spur next to the boiler turned on? These sound trivial, but between them they account for a fair number of the calls we attend.

If you have a hot water cylinder rather than a combi, the immersion heater is a useful stopgap. Switching it on will give you hot water in an hour or so while you wait for us.

In a cold snap, a frozen condensate pipe is the most common cause of a boiler lockout in Manchester. It is the white plastic pipe that runs outside from the boiler. If the boiler failed on a freezing morning and the code suggests a condensate fault, tell us; it is a quick thing for us to deal with, and we will say if there is something safe you can do in the meantime.

What you must not do

Do not remove the boiler casing. Everything behind it is gas work, and it is illegal as well as unwise for anyone who is not Gas Safe registered to touch it. Do not reset the boiler more than once; if it locks out again, it is telling you something, and repeated resets can make a fault worse. Do not touch gas valves, isolation valves or anything you cannot name.

If you smell gas at any point, stop. Do not operate light switches or anything electrical, open the windows, leave the property and call the National Gas Emergency line on 0800 111 999. Then call us for the repair once the supply has been made safe.

What we usually find

On combi boilers, hot water failures with heating still working are very often a diverter valve that has stuck, or a plate heat exchanger scaled up by Manchester's water. Neither is a job for a homeowner, but both are routine for us. A boiler that has lost pressure usually has a small leak somewhere on the system or a failing expansion vessel. Full lockouts can be anything from a failed fan or pump to an ignition or electronics fault.

On cylinder systems, a failed motorised valve, a faulty cylinder thermostat or a burnt-out immersion element are the usual suspects. Older cylinders in the larger houses around Hale and Bowdon sometimes have a control setup that has been added to over the years, and the fault is in the wiring between the parts rather than any one component.

We diagnose properly rather than swapping parts on a guess. If the boiler is old enough that a repair does not make sense, we say so and give you a straight figure for the alternative.

What happens when you call

Call 07343 065023 with the error code, the pressure reading and whether heating is affected. We give you the callout price before anyone is dispatched, and a Gas Safe registered engineer attends. Our boiler and hot water page explains the work in more detail. If you have no heating in cold weather, or anyone vulnerable in the house, treat it as urgent and use the emergency line instead. Rates for both are on the pricing page.

When to stop

Stop and call if the boiler locks out again after one reset, the pressure gauge reads zero, or anything needs the casing removed.

Call 07343 065023