Could be the blower motor relay. Could be the furnace control circuit board. Could even be a fuse (there can be one in your normal fuse block, but oftentimes there’s at least one inline with the power wiring AT the furnace). We’d start there. Reply Aeron December 5, 2024 at 07:...
Blower motor To test the blower motor on its own, you will need a 12V power supply like an RV or car battery. Next, place the test leads to join the positive and negative wires of the blower motor to the positive and negative terminals of the battery. The fan should start immediately....
Next, use a wire to connect and test each terminal—R and G, R and W, and R and Y—by turning the furnace on and off between tests. If Blower Motor comes on at R and G, Heating at R and W, and Cooling at R and Y, then the control board can likely be saved. This simple ...
In using this design, the goal is to replace the controller currently being used, which is aWhite Rodgers 5D51-90 fan and limit controlinserted 8” into the heat chamber. The 5D51-90 fan and limit control is made up of two bimetallic switches, a limit swi...
FIG. 2 is a schematic diagram of the control circuit of the present invention; FIG. 2A is a diagram of the compressor and outdoor fan circuits; FIG. 2B is a wiring diagram of the fan control circuit; and FIG. 2C is a wiring diagram for the furnace control circuit. ...
FIG. 2 is a wiring diagram for the heat pump conversion system of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENT The mechanical installation of a heat pump conversion system according to the present invention is shown in FIG. 1 and includes a furnace 10 having two sets of elect...
5.3 MAINTENANCE OF THE BLOWER MOTOR The two motor bearings must be lubricated once a year using non detergent SAE 20 oil (Marathon motor only). DO NOT OVERLUBRICATE 5.4 FILTERS The furnace must not be operated without filters. In order to efficiently and safely operate a slow combustion ...