The short answer
A Worcester Bosch boiler should be serviced once a year by a Gas Safe registered engineer for gas models or an OFTEC registered technician for oil models. The annual service is normally a condition of the manufacturer's guarantee, and it checks combustion, safety devices, seals, condensate and controls. Jamie Crawford Heating is a Worcester Bosch Accredited Installer registered for both gas and oil.
Why the annual service protects your guarantee
Worcester Bosch guarantees, like most manufacturer guarantees, are conditional. The boiler needs to be registered after installation and serviced every year, with the service recorded. If a part fails and the service history has gaps, a claim can be refused. Keep every service record in the same place as the benchmark or commissioning sheet.
What a Worcester gas boiler service covers
A gas service is about proving the appliance burns safely and efficiently, then checking the parts that wear. The engineer compares the readings with the manufacturer's figures and investigates anything outside them.
- Visual check of the case, seals, flue and terminal
- Flue gas analysis to confirm safe, clean combustion
- Gas pressure and burner operation checked
- Condensate trap and pipe inspected and cleared
- Expansion vessel and system pressure checked
- Safety devices, controls and any fault history reviewed
What changes on a Worcester oil boiler
Worcester Greenstar oil boilers need more hands-on work than their gas equivalents. The burner is removed and cleaned, the nozzle is normally replaced, electrodes are checked and set, filters are renewed and the pump pressure is measured. A combustion reading is then taken and recorded.
Because oil comes from a tank on your property, a good oil service also looks at the tank, the sight gauge, the fire valve and the supply line. Many oil breakdowns start outside the house, so leaving those checks out gives only half the picture.
Signs your boiler is overdue
Some warning signs are easy to spot. Pressure that keeps dropping, a yellow or lazy gas flame, soot marks around an oil boiler, a gurgling condensate pipe, new noises, or a fault code that clears and returns are all worth reporting to an engineer. None of these mean the boiler is finished, but each is cheaper to deal with before it turns into a winter breakdown.
Getting ready for the visit
Clear the space in front of and below the boiler and make sure the flue terminal outside can be reached. Have the previous service record and any guarantee paperwork to hand. If you have noticed anything odd, such as a code on the display or a radiator that stays cold, write it down so the engineer can look at it during the same visit.
Servicing for landlords
If the property is let, the annual landlord gas safety check and a boiler service are two different things, although they are often done on the same day. The safety check produces the record a landlord must keep. The service keeps the boiler working and the guarantee valid.
Keeping the boiler healthy between services
A few simple habits help. Check the pressure gauge now and then; most sealed systems sit around one to one and a half bar when cold, and your manual gives the exact figure. Run the heating briefly in summer so pumps and valves do not seize. In freezing weather, a condensing boiler can stop if its outside condensate pipe freezes, and pouring warm, not boiling, water over the pipe usually clears it. Never remove the case yourself, and report any repeated fault code rather than resetting it over and over, because the code history helps the engineer find the cause quickly.
Frequently asked questions
How often should a Worcester Bosch boiler be serviced?
Once a year. That keeps the manufacturer's guarantee valid and catches worn parts before they cause a breakdown.
Does it have to be a Worcester accredited engineer?
The guarantee needs the service to be carried out by a suitably registered engineer and recorded. Using a Worcester Bosch Accredited Installer means the work is done by someone familiar with the range.
Do you service Worcester oil boilers as well as gas?
Yes. Jamie Crawford Heating is Gas Safe registered for gas and OFTEC registered for oil, so both Worcester ranges are covered.
Is a service the same as a landlord gas safety certificate?
No. The safety check records that gas appliances are safe. A service maintains the boiler. Both can be booked for the same visit.
Related pages
Book a Worcester Bosch service
Based at 24 Bristol Rd, Radstock BA3 3EE. Open Mon–Fri 8:30am–5:00pm.