A faulty boiler can produce carbon monoxide which is a gas that you cannot see, smell or taste.  Carbon monoxide can kill.  If you haven’t already got a carbon monoxide detector installed then our advice to you would be to have one installed, preferably with an alarm.  Have this installed near the boiler and check every month to make sure it is working.  If you would like one installing then please do not hesitate to contact us to arrange this.  Peace of mind and lives, all for the cost of £75 inc VAT.