AboutJ Cook Expertise With 25+ years experience, I am familiar with residential, commercial, and industrial HVAC equipment including but not limited to boilers, chillers, reciprocating and screw compressors. I am trained in all manners of control wiring.
Experience I currently have three HVAC licenses and Refrigeration license by the State of North Carolina. I have been in this field for over twenty years. I have been a service technician for a contractor and also worked at a state college in the repair and maintenance of steam lines and equipment. I am currently the Building Maintenance Superintendent for a municipality.
Question Hello, I am having some problems with our Lennox furnace. It is model # G20Q2E-75-7. We came home after a weekend away and the blower/fan would not come on at any position on the thermostat. I took the front covers off and found a 2 amp fuse that was blown. I replaced it but it blew immediately as soon as the power was turned back on. The blower turns freely and was not making any noise previously. Any advice on where to look would be greatly appreciated.
Thanks
Answer With this fuse blown, there is a short in the control circuit. This could be anything from the transformer, to a control device or the wiring. Try disconnecting the wires on the outlet side and verify there is 240 volts entering the transformer and 24 volts out. This will let you know if the transformer is good. If so, you can disconnect the control devices and as each one is put back on, see if this is what blows the fuse. Thanks J
