The first cold week of the year can reveal problems your heating system has been hiding all summer: radiators that stay cool, a boiler that struggles to start or a thermostat that no longer seems reliable. A little preparation can help you spot issues early, improve comfort and avoid rushing to find help when temperatures drop. Use this guide to check your system safely before you need it every day.
Start with a visual check
Before switching the heating on, take a few minutes to look over the equipment. Check around your boiler, hot-water cylinder, heat pump or other heating appliances for signs of leaks, corrosion, unusual marks or damage. Make sure the area is dry and clear, and that the appliance’s air vents and accessible flue outlets are not blocked by stored items, leaves or garden growth.
Do not remove boiler covers or try to inspect internal components. Keep the appliance clear in line with the manufacturer’s instructions, and never cover a boiler or block its ventilation. If you notice water leaking, damage, a persistent unusual smell or anything that concerns you, leave the system off if it is safe to do so and contact a qualified heating professional.
Check your thermostat and controls
Set your thermostat to a temperature that feels comfortable, then check that the heating responds as expected. If you use a programmer or smart thermostat, confirm the time, schedule and selected heating zones are correct. A summer schedule may not provide enough heating during colder weather, while a flat battery can leave some wireless controls unresponsive.
Try the system manually as well as through its usual schedule, if your controls allow it. Check that radiator valves and room thermostats have not been turned down or switched off. If you have a smart heating system, make sure it is connected and that any app settings still match your routine. Consult the manufacturer’s instructions if you are unsure how to change a setting; avoid adjusting installer-only or technical parameters.
Give the heating a short test run
Switch the heating on for a short period while you are at home and listen for anything unusual. The system should start and heat the rooms in a way that is broadly consistent with how it has worked before. Note any repeated clicking, banging, gurgling, persistent humming, error messages or radiators that remain cold. A brief test gives you time to arrange an inspection before the system is under daily demand.
For a radiator system, feel each radiator carefully as it warms. If the top is cold while the lower part heats, trapped air may be the cause. If only one radiator is cold, the issue may be local; if several are affected, the system may need professional attention. Do not assume that bleeding a radiator will solve every problem. On a sealed system, bleeding can reduce pressure, and the correct pressure and procedure depend on the appliance and installation. Follow the manufacturer’s guidance or ask a qualified professional if you are uncertain.
Check boiler pressure and servicing records
If you have a boiler with a pressure gauge, check it against the range stated in the boiler manual. There is no single suitable reading for every system, so use the manufacturer’s instructions rather than relying on a general figure. If the pressure is outside the recommended range, keeps falling or rises unusually, arrange advice from a qualified heating engineer. Do not repeatedly top up the system or try to fix a pressure fault without knowing the correct procedure.
Check when the appliance was last serviced and whether any recommended work is outstanding. Regular servicing can help identify wear, unsafe operation or developing faults; it is particularly important to follow the manufacturer’s maintenance guidance and any requirements attached to a warranty. A service is not the same as an emergency repair, so book ahead if the system is due for attention.
For gas appliances, use a Gas Safe registered engineer for gas work. For other systems, such as oil, biomass or heat pumps, choose a professional with the appropriate training and experience for that equipment.
Keep radiators and heat pumps unobstructed
Move curtains, furniture and laundry away from radiators so warm air can circulate. Dusting radiator surfaces and keeping them clear can also help them heat rooms more evenly. Avoid placing items on or directly against heating equipment, and do not use radiators to dry clothing unless the appliance is designed for it.
If you have an air-source heat pump, keep the outdoor unit clear of leaves, snow, stored items and other obstructions. Follow the manufacturer’s advice for routine cleaning, and do not dismantle the unit or attempt repairs. Heat pumps often operate differently from boilers, so check that the controls and heating schedule suit your system rather than making large temperature changes based on boiler habits.
Protect pipes and check safety alarms
Locate the stopcock so you know how to shut off the water if a pipe leaks. If you have exposed pipework in a cold area, such as a loft, garage or outbuilding, check that insulation is intact. Do not block ventilation openings or conceal equipment while improving insulation, and ask a professional if you are unsure how to protect pipes safely. If your home will be empty during a cold spell, check your insurer’s requirements and the heating system’s frost-protection instructions before deciding what to switch off.
Test your carbon monoxide alarm according to its instructions and check that smoke alarms are working. A carbon monoxide alarm is an important safeguard, but it does not replace regular maintenance or safe use of appliances. If a carbon monoxide alarm sounds, or anyone has symptoms such as headache, dizziness or nausea while an appliance is in use, get everyone outside and seek emergency advice. If you smell gas, do not operate electrical switches or use a naked flame; leave the property and call the National Gas Emergency Service on 0800 111 999.
Arrange help before the cold sets in
If your heating does not start, repeatedly loses pressure, shows a fault code or makes persistent unusual noises, avoid repeatedly resetting it or attempting repairs. Make a note of what happens and any messages displayed, then share those details with a qualified professional. Early attention can make it easier to diagnose a fault and gives you time to plan before the coldest days arrive.
Book a heating professional
Get your system checked, serviced or repaired before the first cold week. Book a heating professional through Task Pigeon to find help for your home heating needs.