I have a one year old Kenmore Dishwasher model # 587.15100981 that will not spin, water will fill and empty but will not cycle or spin the arms. I cannot find any obstruction in tube, or anything in the arms, they both will spin easily. I have ran the dishwasher with nothing in it, and it does the exact same thing, would I be better off financially buying a new one, or repairing the pump?

SOURCE: Kenmore Dishwasher #587.... doing nothing but heat dry

The problem appears to stem from the float and float switch. The float is a mushroom shaped plastic part that resides on the bottom left, just inside the door. It appears that the float does not release the float switch, causing the dishwasher to think it is full of water, and won't allow the dishwasher to fill. It's a relatively straight forward repair, but even with a new part, the same scenario is likely to repeat itself until the float or float switch is modified by Kenmore.

SOURCE: Upper arm does not spin

Hi,
OK, the arm is jet-propelled, so it will spin if it is free to rotate and has water squirting down into it. If it >is< free to rotate, then either the water isn't squirting, or it is missing the target. On my machine - different brand - the guide cone came loose when I dismantled the upper bar assembly and it hadn't gone back correctly aligned, so the water missed the hole.

I'd check that first. D.

SOURCE: KENMORE DISHWASHER WATER DOESN'T SPRAY.

If there's no water entering your dishwasher, check these:

Water-inlet valve
Float switch
Water-inlet valve
The water-inlet valve lets water enter the machine. If this valve is defective, you need to completely
replace it. It's usually located behind the lower access panel on the left or right side. It's the device
with the main water line (usually copper) from the house, a rubber tube to the dishwasher, and two
wires attached to it.

Float switch
The float switch is a small electrical switch that's located right below the dishwasher "floor."
Above the switch, on the inside of the dishwasher, is a plastic cylinder that floats up as water fills
the dishwasher. If this switch is defective, or if the plastic float gets caught or trapped in the raised
position, the water can't enter the dishwasher. If the float switch is defective, you need to replace it.

SOURCE: The spary arm on my bosch dishwasher wont spin.

you have a failed circulation pump

SOURCE: Frigidaire Dishwasher - Spray Arm Not Working

When a dishwasher has been checked for obstructions in the sump area and the spray arms can spin easily (by hand) plus the spray arm holes are not blocked, you end up with either a broken impeller or a failing wash pump motor.

If you would like more details of have more questions, please post comment back here, OK?

Good Luck!