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Most likely the fan relay is defective or the electric heater is defective. If the fan will not turn off, the cause is generally the electric heat is being back feed from a defective heat strip., Recommend call pro. If so inclined, remove power, breaker etc find 1/4or 5/16 driver and Remove panel from the ah. Look for the fan and follow the wires back to the relay( this is usually black,for high speed, blue for.med and red for low ) Follow the fan speed tap to the relay. If the relay is burnt or looks defective replace this part. If no defect is obvious remove the wire from the NC (normally closed) connection. Plug the power and check to see if the fan starts with out command. If the fan starts it definitely the relay. Note the wire removed from NC might be hot check with meter if it is and the electric heat is signalling the fan to run and most likely source of defect is the heat sequencers, (switch relays for high voltages) replace this part
This is going to be a tough one to explain, but from the schematic I found, this is a transformer/controller all in 1. So we are using this 1 module for 2 purposes. The R terminal should connect to the wire that's connected to R at the thermostat. And the C terminal should connect to the C wire coming from the C terminal at your t-stat(if used), as well as your common that returns power from your contactor at the o.d. unit. You'll have 2 wires going to the o.d. unit, 1 connects to Y and 1 connects to C to the 8a501 box. The G and W should also be connected to the wires that connect to G and W at the t-stat. That is your low voltage side. Now, this line voltage side is more difficult. You'll need to know what wires are your fan speed taps on your blower motor. And also, does your unit close the N/O(normally open) contacts for heat or cool? Normally it closes for cooling, so your high speed wire would connect to the n/o wire, and your line voltage supply would connect to the bulk/yellow. And then your medium or low wire from your blower would connect to the N/C wire. The schematic is there on the side of the module. This may be beyond your experience and may cause motor winding failure with in seconds of operation. Also, ensure with a volt meter that all power is disconnected! And all run capacitors are discharged! I've not wired 1 of these modules but from the schematic, seems simple, AS LONG AS YOU KNOW WHAT THE MOTOR SPEED TAPS ARE. Hope this helps, and if you're unsure, call a professional. The labor should be less than the cost of a damaged motor.
In order to hook this up to the fan on your furnace, you will need to either have or install a Fan center @ the furnace. (Unless it is gas, and has a circuit board that will simplify the process) All this is, is a transformer, a relay, and a set (or two) of NO and NC contacts. You will need to run 3 wires from the thermostat back to the furnace, if you do not have them already. If you have a gas furnace with a circuit board then all you have to do is connect the three wires from the thermostat to the board. (R to R; W to W; G to G. If you are using an older furnace, or a oil fired appliance, power should go out of the transformer (secondary side) to the thermostat on R. It should then come off W and another wire off G back to the furnace. Connect to the appriately marked terminals on the fan center. Hope this helps
This should be 110v so you will have black wires, white wires and ground wires. The grounds wires both go to the ground bar, the whites wires both go to the nuetral bar, or can be wire nutted together, the black incoming (feed) wire goes to the buss bar that the breaker plugs into and the black going to the furnace goes into the breaker lug.
Some one missed the wiring diagram. I believe its like this: L1 = Line 1 = (Hot all are same thing) Black Hi Blue Med Red LO Now usually the black is for AC and connects to a normally Open (NO) contact on the blower relay. The heater speed (either red or blue) go the the normally Closed (NC) on the blower relay and on one side of this wire or contact on the relay it goes to the heating blower thermostat on the furnace. The remaining wire (blue or red) you tape off. L1 also feeds the Run Capacitor on 1 side and the Brown wire feeds the opposite side
The white wire is Neutral and goes to the neutral on the main line.
If this helps you please rate me accordingly and good luck.
If you chose to install this with an auxilary transformer. Turn the main power off to the furnace. Mount the transformer on the handi box to the furnace or inside the furnace cabinet. Wire the primary wires from the transformer to the main power coming into the furnace. Connect black to black and white to white. Wire the secondary side of the transformer in "series" with a #50 relay, the humidistat, the solenoid valve and back to the transformer. Determine which wire powers the blower motor for the heating speed. Clamp the #50 relay to the wire.