Worcester Bosch boiler service in Northern Ireland

• Greenstar: the gas range, in combi, system and regular (heat only) versions. Most Worcester boilers in Belfast and other gas towns are Greenstars of one generation or another.
• Danesmoor: the floor-standing oil range, fitted indoors or as an external model outside the house.
• Heatslave: oil combi boilers that heat hot water on demand from the boiler itself.

Some Greenstar models can run on LPG. If yours does, tell us when you book so the right engineer comes out.

Every visit follows the manufacturer’s service checklist for your model, not a general once-over. On a gas Greenstar, a Gas Safe registered engineer will typically:

• check the gas pressure and the burner, and test the flue gases with a calibrated analyser;
• inspect and, where the manual calls for it, clean the condensate trap and siphon, which is a common cause of lockouts if it blocks;
• check the expansion vessel charge and the system pressure;
• test the safety devices, seals and flue for soundness;
• record the readings on your service record.

On an oil Danesmoor or Heatslave, an OFTEC registered technician will typically replace the nozzle and fuel filter, clean the combustion chamber and heat exchanger, check the electrodes and photocell, set the burner using a combustion analysis, and fill in an OFTEC CD/11 service record. We also give the oil tank and fire valve a visual check.

The full list is on our boiler service checklist guide.

Worcester Bosch is known for long guarantees on new boilers, but those guarantees usually come with conditions. In general terms, the boiler has to be serviced every year by a registered engineer and the service recorded. Miss a year and a later claim can be refused.

The exact rules vary by model, by when the boiler was fitted and by who fitted it, so check your guarantee terms. If you are not sure when your boiler was last serviced, book one now and start the record again.

Most calls we get about Worcester boilers fall into a few groups:

• Low pressure. The display shows a pressure warning and the boiler stops. Usually a top-up fixes it, but a boiler that keeps losing pressure has a leak or an expansion vessel problem. See boiler pressure low.
• Lockouts in cold weather. On condensing gas boilers, a frozen or blocked condensate pipe can stop the boiler. Gurgling sounds from the pipe are a clue.
• Oil lockouts. A Danesmoor that will not fire is often down to fuel supply, a worn nozzle or a dirty photocell. Our oil boiler not firing guide covers what you can safely check first.
• Noises. Kettling or banging usually points to scale or poor circulation. See boiler noises.

We do not publish fault code tables here, because codes differ between Greenstar generations. Your user manual lists the codes for your exact model, and an engineer can read them properly on site.

Gas service £79, oil service £89, fixed and including VAT. Book online and pick a slot, or email [email protected]. Gas Safe To confirm: gasSafe, OFTEC To confirm: oftec.