If the engineer does not check the following on a warm air unit,then the service is not being carried out as it should,which should be annually.also purchase a carbon monoxide detector(looks like a smoke alarm).
burner pressure,flue flow test(smoke pellet),in the loft making sure flue is connected to ridge,spillage test,ventillation(is correct)(if any at all),burner to be cleaned,injector to be checked(and cleaned),filter to be cleaned,fan to be checked and cleaned,overall operation of unit.Do not let a year go by without having your unit serviced and checked it could be fatal.Hope this helps.
gas engineer.
January 2009
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