Whirlpool AWM1200 washing machine wont advance at certain stages

If it drains during the other stages of the cycle it sounds like there is a faulty control that tells the unit to drain at the end of the cycle. If it is not draining during any of the stages of the wash cycle it may be a faulty pump.

What is the model number?
Check the lid switch. You should here a click when you push and release it. If no click is heard, replace the lid switch. Here is the part you need.

Sounde like a bad lid switch . With no model number , can't help you further .

This assumes that you have a basic Kenmore / Whirlpool top load, direct drive, neutral drain (it doesn't spin until the pump removes most of the water) machine.

First, see the Sears parts site for your washer:
http://www.searspartsdirect.com/partsdirect/index.action

Enter your model number and you'll see a list of major sub-components with diagrams and parts.

The drain and spin functions are started when the timer advances to the spin mode.

The motor is reversible. When agitating, the motor spins one way, when going to the drain / spin mode it reverses.

Since the machine agitates, the problem points to the timer.

The problem must have been fixed by now.

I think that the problem was not the belt.

If machine does not advance to spin, check the hose attached to drain pump, ensure that drain pump is working, and check or replace pressure switch.

If that does not fix the problem, check the variable speed motor and gear case.

CHANGE THE LID SWITCH

Power shd be on. Right side of control panel, "end of cycle", hold this down for 3 seconds.

The cycle doesn't advanceWhen the cycle doesn't advance, it's probably the timer or a cold-water supply problem:

It's the timer, if your washing machine fills with water and begins agitating, but the timer never advances--or if the washer is in a spin cycle and the timer won't advance. Then you need to replace the timer.

It may be a cold-water supply problem, if the washing machine fills with water, agitates, drains, and spins, but then doesn't fill with rinse water. See There's no cold water.

Remove drain hose from where it connects to the plumbing under the sink/tub. Inspect the spigot. If clogged, clean. If clean, then tilt machine back and remove drum to pump hose from pump. Check hose and also drain pump. Clear any obstructions.

Sounds like a relay on the board. Have you tried to reset the machine by switching it off at the wall and leaving it for about 20 seconds before switching on again?