Quote:
Originally Posted by boscoboy
Came home from vacation to an 80 degree house. Outside compressor was running wild and doing his best but absolutely no air coming from the vents. Tried just setting the fan to ON and nothing.
Off to the HVAC supply. Bought a 5mfd cap for $4.32 hoping against all hope it would jump start the fan but no joy. Opened up the cabinet (2007 Trane XL80) and pulled out a filthy, original 1/3hp motor that was frozen solid. Back to the supply house, $127.55 and 90 mins later cool air is flowing again!
Pro-tip. Even if its 80 degrees when you replace the blower motor you should probably also test your heat. I did not.
First cold day we put the thermostat on Heat and the blower starts up but not getting any heat - pull the panel off and the burner not lit, checked the obvious like blocked condensation line, blocked air intake, blocked air outtake, gas line not open, etc - did a hard reset and nothing. Rechecked all the connections on the main circuit board and they seemed tight and correct.
Couple YouTube vids later and I am using a jumper on the 'High Limit Switch' which bolts to the metal blower assembly that would shut down the furnace if it runs too hot. Bingo - it kicks on and we have flame. Cost of the switch is $82 so I figure remove it, clean it, test it for continuity then clean and re-crimp the spade contacts. Back in business at a total cost of $0 and about an hour of troubleshooting.
Guessing a paid HVAC wouldn't have made this mistake since my initial disassembly is likely what caused this issue, but then again I have my doubts