September and early autumn are a sensible time to check your heating system before colder weather arrives. Testing it now gives you time to deal with cold radiators, unreliable controls or boiler faults before you depend on your heating every day.
TNG Services Ltd provides boiler servicing and heating repairs in Stevenage, Hertfordshire and North London. This guide explains what to look out for at home and when to arrange a professional visit.
Why check your heating before winter
Your boiler may have supplied hot water throughout summer while the radiators remained switched off. That does not tell you whether the heating will work properly when you need it. A problem with a thermostat, radiator valve or heating circuit may only become noticeable when you turn the heating on.
Finding a problem early gives you more time to arrange an investigation and any necessary parts or repairs. Keep your annual service appointment even if it falls at another time of year; a seasonal check is useful alongside regular maintenance.
Test your heating and check each room
Use your normal heating controls to request heat and allow enough time for the system to warm up. Check that each room responds as expected, including separate upstairs, downstairs or underfloor heating zones where fitted. Radiator surfaces can become hot, so take care.
Look out for:
• Radiators that stay cold or have persistent cold patches.
• Rooms that remain uncomfortable after the heating has been running.
• Gurgling, banging or other unusual noises.
• Boiler fault messages or repeated shutdowns.
• Damp patches or visible drips around accessible pipework and valves.
Make a note of which rooms are affected and photograph any fault code. These details help us understand the problem when you contact us. Once you have finished, return the controls to your usual settings.
Arrange your annual boiler service
An annual boiler service helps identify faults and check that the appliance is operating safely. HSE recommends annual servicing by a suitably qualified Gas Safe registered engineer.
At TNG Services Ltd, we carry out boiler servicing in line with the manufacturer’s instructions. Depending on the appliance and its service requirements, this includes inspecting its condition, checking the flue and combustion, completing the required operating checks and carrying out the specified cleaning and maintenance.
We explain our findings and advise you on any further work and its cost. If your boiler has a warranty or guarantee, check its servicing conditions and keep your service records.
When booking, tell us about any problems elsewhere in the heating system. Investigating cold rooms, circulation faults or hot water issues may require additional checks alongside the boiler service.
Investigate cold radiators and pressure loss
Uneven heating can have several causes. Trapped air can leave a radiator cold at the top, while deposits or restricted circulation can contribute to cold areas lower down. A radiator that stays completely cold may have a valve or flow problem. These are clues for an investigation, rather than a diagnosis on their own.
The appropriate solution might involve venting, balancing, repairing a valve or addressing system contamination. We assess the cause before recommending work such as a power flush.
If your heating uses a sealed system, check the pressure display against the guidance in your boiler’s user manual when the system is cold. Repeated pressure loss needs investigating. Continually adding water can hide an unresolved problem; record how often the pressure falls and tell your engineer.
Follow the manufacturer’s instructions for any homeowner maintenance. Leave boiler casing removal and work on gas components to a suitably qualified Gas Safe registered engineer.
Check thermostats and heating controls
Review your heating schedule as your routine changes for autumn. Check the clock, any summer or holiday setting, and the batteries where your thermostat uses them. If you use smart controls, make sure the app can communicate with the system and that the heating responds to a request.
Keep thermostats and thermostatic radiator valves clear of furniture and curtains so they can sense room temperature properly. Set your controls for comfortable conditions in the rooms you use. Energy Saving Trust explains how heating controls can help avoid unnecessary energy use.
Ask us about suitable settings for your particular system. Homes with a hot water cylinder need settings that also allow the stored water to reach a safe temperature.
Check hot water and exposed pipework
If you have a separate hot water cylinder, include it in your maintenance plans. Check whether the hot water heats as expected and report visible leaks or unusual discharge from the cylinder’s safety pipework. Unvented cylinders have their own servicing requirements, which should be followed by an engineer qualified to work on them.
Before frost arrives, look from a safe, accessible position for damaged or missing insulation on exposed water pipes. Ask your engineer to assess any vulnerable external condensate pipework. Keep flues and ventilation openings clear.
Test your carbon monoxide alarm
Test your carbon monoxide alarm as its manufacturer directs and check its replacement date. An alarm is an additional safeguard alongside regular appliance servicing. HSE provides advice on maintaining CO alarms and gas appliances.
If you smell gas or suspect a carbon monoxide leak, leave the property and call the National Gas Emergency Service on 0800 111 999 from outside. Avoid flames and operating electrical switches. Do not use a gas appliance you suspect is unsafe.
Heating services in Stevenage and surrounding areas
TNG Services Ltd helps homeowners and landlords with boiler servicing, heating fault finding, radiator and valve repairs, heating controls and unvented hot water cylinders.
We cover Stevenage and surrounding Hertfordshire areas, including St Albans, Hatfield, Hertford, Letchworth, Watford and Radlett, together with North London areas such as Mill Hill, Highgate, Edgware and Enfield.
Whether you need a routine service or help with a fault, send us your postcode, boiler make and model, and a brief description of the issue. We will advise on the appropriate visit.
Frequently asked questions
When should I check my heating before winter
Early autumn is a practical time to test it, while there is still time to arrange repairs before colder weather. Keep to your boiler’s service schedule throughout the year and arrange help promptly if a fault appears.
Do I need a service if my boiler seems to work normally
Yes. An appliance producing heat can still need maintenance. Arrange annual servicing with a suitably qualified Gas Safe registered engineer and follow the manufacturer’s requirements.
Does a boiler service cover every radiator and the hot water cylinder
A boiler service focuses on the appliance and its specified servicing checks. Tell us if you would also like your radiators, controls or cylinder assessed so we can agree the scope of the visit.
Does a cold radiator always need a power flush
No. The cause could involve air, valves, balancing or circulation. System cleaning is one possible remedy and should follow an assessment of the fault and the system’s condition.
Can checking my heating help with running costs
Finding faults and using suitable controls can help your heating work more effectively. Any saving depends on your system, property and how you use it; a service alone cannot promise a particular reduction in bills.
Book your heating check before winter
Get your heating checked while there is time to put problems right. Contact TNG Services Ltd to arrange boiler servicing or discuss a heating-system fault in Stevenage, Hertfordshire or North London.
Call 07776 448020 or email info@tng-services.co.uk with your postcode and the work you need.