| Do you have the blower relay and transformer mixed up? Transformers may hum a little, but never click. If the outside compressor is running, the transformer is fine. However, the relay could have been stuck closed and opened in response to the screwdriver. It could be not working at all now. Check to see you have AC to the relay plus 24 volts to the relay coil, the pair of smaller wires, maybe red and blue to it. If so, and don't have AC to the blower, the relay is bad. |