I have a propane furnace (coleman ) installed two years ago. When it flashes 3 times it is indicating that the pressure switch has failed. Open furnace door and you will find a round black unit attached by hoses to a round duct beside the flashing unit. I have had to have this switch replaced twice in two years at dealers expense. Coleman rep says chimney not high enough yet when switch is replaced furnace is fine. I contacted another dealer in my area and he will not install another one of these furnaces because this switch keeps failing on all of them. I am going to install a different furnace after two years at a cost of approx. $4000 because I am fed up with taking time off work to accomodate the repairman, or fight to get my money back from original installation.
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