I just had my whitfield pellet stove cleaned by a professional,I have never had any problems with it...when he was cleaning it,he said it probably wouldn,t last much longer,that is old.low and behold soon as it got cold out i turned it on,no problems......when i turned it off upon cooling it made a terrible scereching noise and the dogs took off for the hills.does any one have any Ideas on what this problem could be,before I blame the repaireman?thx john