What causes the spin cycle not start. I tried the door switch

Bill, there are to many things to list here. Outside of the door latch the top two are:

Motor Coupling

If the washer won't spin the motor coupling might have failed. The motor coupling connects the motor to the washer transmission. It is designed to fail if the washer is overloaded in order to protect both the motor and transmission.

Drive Belt

If the washer won't spin, check the drive belt. If the belt is broken or if it isn't tight on the pulleys the washer won't spin properly.

Can you give us any other symptoms?

UPDATE

Here are the many possible other causes:

Door Latch

If the washer won't spin the door latch should be checked. The door latch can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

Door Lock Motor and Switch Assembly

If the washer won't spin the door lock assembly should be checked. The door lock can fail either mechanically or electrically. Test any switches on the door lock with an Ohm meter. The switches should have continuity according to their design.

Motor Control Board

If the washer won't spin the motor control board might be defective. The motor control board provides power to the motor as well as direction and force. If the motor control board is defective the washer may not work at all or function properly.

Drive Block

If the washer won't spin the drive block might be worn out or may have come loose. Underneath the agitator the drive block connects the inner tub (the one that spins around) to the transmission. If the drive block wears out the transmission shaft will still spin but the tub may not - or it may spin slowly. This also usually causes a lot of noise. The drive block is relatively easy to replace.

Clutch

If the washer won't spin, the clutch assembly might be worn out. The clutch assembly makes the connection between the transmission and the inner tub. It is designed to allow the tub to get up to the proper spin speed gradually. As the clutch wears out it may prevent the tub from spinning. The clutch is not repairable, if it is loud or not working properly it will need to be replaced.

Drive Pulley

If the washer won't spin then the drive pulley might be worn out, seized, or damaged. Remove the drive pulley and inspect it carefully. If it is damaged or defective replace it.

Clutch Band kit

If the washer won't spin, the clutch band kit might be worn out. The clutch makes the connection between the transmission and the inner tub. It is designed to allow the tub to get up to the proper spin speed gradually. As the clutch wears out it may prevent the tub from spinning. If the washer won't spin, this clutch band kit may need to be replaced.

Drive Motor

If the washer won't spin the drive motor might be defective. This is not common. Check all of the other related parts to this symptom before replacing the motor. If the motor is visibly burned out or physically damaged It will have to be replaced.

Stator Assembly

If the washer won't spin the stator assembly at the back of the washer tub might be bad or damaged. The rotor is essentially one half of a motor, it interacts with the tub by creating a strong electro-magnet. If the rotor fails or is damaged the washer might not spin or agitate. Check the rotor for damaged magnets or other defects.

Rotor Assembly

If the washer won't spin the rotor assembly at the back of the washer tub might be bad or damaged. The rotor is essentially one half of a motor, it interacts with the tub by creating a strong electro-magnet. If the rotor fails or is damaged the washer might not spin or agitate. Check the rotor for damaged magnets or other defects.

Tub Bearing

If the washer won't spin the tub bearing might need to be replace. This is a very involved repair and will require disassembling most of the washer. The manufacturer recommends that if possible the complete outer tub and bearing be replaced rather than attempting to replace just the bearing in the tub. If the bearing is bad the problem is going to get worse very quickly and so either the drum and bearing will need to be replaced or the washing machine.

Tub Seal and Bearing Kit

If the washer won't spin the tub seal and bearing kit might need to be replace. This is a very involved repair and will require disassembling most of the washer. If the bearing is bad the problem is going to get worse very quickly and so either the tub seal and bearing kit will need to be replaced or the washing machine.

Bearing

If the washer won't spin the tub bearing might need to be replace. This is a very involved repair and will require disassembling most of the washer. The manufacturer recommends that if possible the complete outer tub and bearing be replaced rather than attempting to replace just the bearing in the tub. If the bearing is bad the problem is going to get worse very quickly and so either the drum and bearing will need to be replaced or the washing machine.

Basket Drive

If the washer won't spin the basket drive clutch might be worn out. The basket drive sits on top of the transmission and engages with the inner tub. If the basket drive wears out the tub won't spin.

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Basket Drive Hub Kit

If the washer won't spin the basket drive hub might be worn out. The hub is a set of plastic gears underneath the agitator that drives the inner tub in spin. The basket drive hub kit is fairly easy to replace with standard hand tools.

Transmission

If the washer won't spin the transmission might be worn out or defective. There are numerous more likely causes when a washer won't spin, which should be checked first.