The Frigidaire dryer would start the cycle, then beep and flash the lights for a few minutes before shutting down. The thermostats, heating coil, fuse, and motor switch were all checked. Everything appears to be in order. Except that when I tested the red and black heater wires on the back of the main control board, I discovered that the red had 120 volts and the black has no output. So, with the dryer turned on, I tested the relay for continuity and found none. Do you have any suggestions?
The relay on the circuit board is broken. It'd have to be repaired. Here is the service link https://www.upfix.com/product-category/appliances/dryer/