These are common faults that indicate a boiler needs servicing:

· Flames appear irregular or yellow

· Smell of fumes or gas - (turn off gas at the gas meter) speak to National Grid then call us.

· Stains or smoke marks around the appliance.

· Overheating - temperature gauge goes above 80 degrees centigrade.

· Pressure drops rapidly - boiler needs refilling more than once a month.

· Fan whines loudly or screeches.

· Pilot goes out repeatedly.

· Poor hot water.

· Radiators don't all heat up at the same time - possibly a boiler fault, or it is equally possible that the system is unbalanced.