I've tested the thermostat, thermister & heat coil and all have continuity, and am down to the control board which is not giving the results and error codes that are expected via the manual. The owner said they had been using the dryer extensivly and noticed that the lint trap did not have as much lint as they expected, I have cleaned out the trap, exhaust and case from all lint and wonder if what other tests I can perform to verify a defective board? (values at point to point, ohm or voltage) to insure the part needs replacment?
Answer Hi Richard. Start by verifying proper 240 vac at the outer 2 terminals at the terminal block. Verify that you are getting 120 vac from each outer terminal ( L-1 and L-2) to the center terminal (neutral). If not see if you have it at the dryer supply outlet. If not then use a qualified electrician to correct house supply issue. Make sure you have control board incoming voltage per following the supplied wiring diagram voltage (120vac). Test the heater relay on the common terminal to see if you have the 120 vac there awaiting the heat cycle to begin. Then as commanded, the heater relay then closes and the output 120 vac then goes to the heater circuit. Take in consideration that the centrifugal switch in the motor has to reach proper speed before it closes the cent. sw. and send the 120 vac to the heater circuit as well. You can manually trip the centrifugal switch disk and see if you now have the 120 vac output from the motor. Make sure all connections there are tight as well. It is common that they get loose there. The motor is part # 131560100. The control board is part # 134523202. The thermistor has to be within a 5% tolerance only. If not it is part # 134587700. The heater is part # 131553900. Make sure you test each component for shorts against the chassis ground. If so replace the component. Thank You.