During a boiler service, a Gas Safe registered engineer inspects the boiler and its surroundings, removes the casing to check and clean the key components, tests how it’s burning gas with a flue gas analyser, checks the safety devices and system pressure, and records the results. On a straightforward boiler it usually takes around an hour.
Doing it before winter means worn parts are found and fixed while the weather’s mild, not when you need the heating every day. You can book a boiler service with us any time of year.
Step by step: what the engineer does
1. Visual checks
The engineer looks at the boiler, flue terminal, pipework, controls and the area around the boiler for leaks, corrosion, soot marks, damage or anything blocking ventilation.
2. Checking the controls
The thermostat, programmer and any smart controls are checked to make sure they’re operating the boiler correctly.
3. Inside the boiler
With the casing off, the engineer inspects and, where needed, cleans:
- The burner and heat exchanger
- The fan and electrodes
- Seals and gaskets
- The condensate trap and pipe
4. Combustion analysis
A flue gas analyser measures the gases coming out of the flue. This shows whether the boiler is burning gas safely and efficiently, and flags problems such as poor combustion.
5. Gas and safety checks
The engineer checks gas pressure and flow, and tests safety devices such as the flame sensor and pressure relief valve.
6. System checks
System pressure, the expansion vessel charge and the condition of the heating water are checked. Dark, dirty water can point to sludge in the system.
7. Paperwork
The results are recorded in the boiler’s logbook or the manufacturer’s online system, and the engineer explains anything that needs attention.
Why before winter?
- Faults show up before you rely on the heating
- Engineers are less busy than in the depths of winter
- Parts can be ordered without leaving you cold
- The boiler runs at its best through the heaviest months of use
How to prepare for the visit
- Clear access to the boiler and any cupboard it’s in
- Have the boiler manual and previous service records to hand
- Note any problems you’ve noticed, like noises or pressure drops
- Make sure the heating has been used recently, so faults are fresh
What if the engineer finds a problem?
They should explain what the fault is, whether the boiler is safe to use, and what a repair involves. If a boiler is classed At Risk or Immediately Dangerous, it will normally be turned off with your permission. For older boilers with recurring issues, it may be worth weighing up a new boiler installation.
Servicing in Lincoln and the surrounding villages
Homes around Lincoln, North Hykeham, Washingborough and Bracebridge Heath range from older terraces near the city to modern estates. Whatever the property, the same annual service applies, and older boilers in particular benefit from being checked before winter.
Frequently asked questions
Do I need to be home during the service?
Usually yes, or someone needs to be there to give access. The engineer may also need to check controls and radiators in other rooms.
Will the heating be off during the service?
Only for the time the engineer is working on the boiler, usually around an hour for a straightforward service.
What’s the difference between a service and a repair?
A service is routine maintenance and inspection. A repair fixes a specific fault. If the service finds a problem, the repair may be done at the same visit or booked separately.
Book your service
If your boiler is due its annual service, give me a call on 07717 224 048 or drop me a message and I’ll get you booked in.