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The start switch on a Kenmore 70 series dryer sits directly behind the button you push in to start the dryer cycle, and it can occasionally go bad. Accessing this switch for repair or replacement is relatively simple; just follow the steps below. (These instructions were written specifically for the Kenmore 73742 heavy duty dryer, but they should apply to all of the dryers in the Kenmore 70 series.)
1. Unplug the dryer from the wall outlet.
2. Pull the dryer away from the wall so you have enough room to get to the rear side of the dryer.
3. Remove the rear access panel. This panel sits horizontally along the upper rear side of the dryer, and it is held in by six slotted screws. Put the screws aside, but do not lose them.
4. The start switch is located on the far left side (as you are looking at the rear of the dryer). It is a small black box with wires coming off of it. Disconnect these wires, but note which wire connects to which terminal for when you reattach them.
To remove the switch and button assembly as one piece, you'll first need to remove the knob from the front of the dryer. You should be able to pull the knob straight off, but if it's tight a pair of pliers might help. The round white plastic piece might come off with the knob; put it somewhere safe so you don't lose it. Then go back to the rear of the dryer and pull the black plastic tab (sticking vertically away from the switch) toward you to release it, and rotate the assembly clockwise until it pulls free from the panel.
To remove the switch from the button and housing, use a small flathead screwdriver to pry the switch up. Two of the four sides are tabbed; pry these two sides up to release the switch. There is a spring that sits behind the start button -- be sure not to lose this spring.
If you push the knob to the left and it makes a good contact and starts the machine, then replace the timer switch. Write down the Name and Model Number of the machine (usually on or below the door)
take it to a local appliance shop and order a new part. When you recieve the new part UNPLUG the machine and remove the three screws from of the top of the electrical compartment and gently pull o the front open, there is only one plug attached to the switch, remove it and dislodge the old switch, then snap the new switch in place and replace the plug, close the compartment and replace the three screws, plug in the dryer, and try it.
IF THIS MODEL USES THE TIMER TO START THE MACHINE BY PULLING OUT ON THE KNOB, I HAVE HAD TO REPLACE QUITE A FEW TIMERS FOR THIS PROBLEM. SOMETIMES BY MOVING THE KNOB UP AND DOWN AND SIDE TO SIDE WHILE PULLING WILL START THE MACHINE. IF SO, REPLACE TIMER.