Washer stops and door unlocks frequently during cycle. Drains slowly possibly causing the cycle to stop and unlock door. Washed rugs just prior and the rubber backing came off the rugs during. Cleaned drain hose but did not fix problem.

If your Hotpoint FDEU 9640 washer-dryer is stopping prematurely during the dry cycle with all the LEDs flashing amber, it could be caused by a few different issues:

1. Check the filter: Make sure the filter is clean and not blocked. A blocked filter can cause the machine to stop working properly.
2. Check the venting: Make sure the venting system is clear and not blocked. A blocked vent can cause the machine to overheat and stop working.
3. Check the heating element: If the heating element is faulty, it can cause the machine to overheat and stop working.
4. Check the thermostat: If the thermostat is faulty, it can cause the machine to overheat and stop working.
5. Check the control board: The control board controls the various functions of the washer-dryer. If it is faulty, it can cause the machine to stop working.
6. If none of the above steps work, it is possible that the machine has a more serious problem that requires professional service.

It is important to refer to the user manual or contact Hotpoint technical support for further assistance and specific troubleshooting steps for your washer-dryer model. It is also important to make sure the machine is not plugged in before attempting any troubleshooting steps. It is also important to note that it is not safe to use a multimeter to test any of the heating element or thermostat

Check all the connections on the control board and the door lock.

Most likely drain Pump problem. Either obstructed or defective

Could be the control panel at fault

Possible that fault is connected with the controller unit. The door is not released even after the cycle hass completed and so there can be some delay in releasing the same. You can try and see if the connections from the controller unit is intact.Also make sure the door locks are free.
Check this link for some clues: washer door lock.

Check and make sure your pump or filter is not clogged, then next I would suspect you have a faulty door lock mechanism
More common issues with the door lock.
Is water hooked up to the washer?

The door will remained locked while draining water. If during installation the washer was plugged in and turned on without water hoses attached, the washer may attempt to drain for 8 minutes before the door unlocks. Let the washer run until the door unlocks. Do not turn off the washer or unplug the washer.
Does water remain in the washer after the final spin?

If water remains in the washer after the final spin, then the door will not unlock. Select Drain/Spin or Spin Only to remove any remaining water from the washer. The door should unlock at the end of the cycle. For models that have Rinse/Drain & Spin, push the Extra Rinse button to turn off the rinse to remove excess water.
Is the door locked and the Add A Garment light on?

If the Add A Garment light is on, then the washer door will unlock after the Pause/Cancel button is pressed once. Pressing the Start button will restart the washer at the same point where it left off in the cycle.
Is the door locked and the Add A Garment light off?

If the Add A Garment light is off, then the washer door will unlock after the Pause/Cancel button is pressed twice. The door will not immediately unlock while the cycle is running due to a possible high-water level in the washer, high-water temperature, tumbling or spinning. It may take up to five minutes for the washer to stop spinning and draining before the door will unlock. You will hear the door click when it unlocks.
Trying to gain access into a locked door can be a bit frustrating. Upon researching your question I found some links that may help you unlock your washer door. I attached all links below. I hope this helps!
http://www.managemylife.com/mmh/questions/204092-how-do-i-get-the-door-open-on-my-kenmore-washer

http://www.managemylife.com/mmh/questions/220303-does-front-loader-door-open http://www.managemylife.com/mmh/questions/134692-why-wont-the-door-open-on-my-kenmore-frontloading-washer

Your blanket probably caused an out of balance on the tub which caused the washer to stop in the middle of the cycle. The lock switch is a time delayed switch. Requires several minutes before it is activated to release. When washing single items you need to add another clothing item of approximately the same weight to create a balance during spin.

The control monitors the door lock prior to and during the spin cycle as a safety feature. The washer will not advance to the spin cycle when the door lock is not activated and stops when the lock is deactivated during the spin cycle.

In your case, the door lock is working intermittently causing the washer to spin intermittently. This is probably due to a faulty door lock and switch assembly or poor connection at the control board or at the assembly itself. Replace the door lock and switch assembly if necessary.

your mach depending on model and cycle selected has a 3 to 5min "add a garment" feature.that means in the 1st 3-5mins of cycles when add a garment light is lit you may hit pause button once and the mach will stop and unlock door.after add a gament light is off,if u hit pause the cycle the mach will drain water and reset cycle..hope this helps

Do you have any error codes?

Does water remain in the washer after the final spin?
If water remains in the washer after the final spin, then the door will not unlock. Drain/Spin or Spin Only to remove any remaining water from the washer. The door should unlock at the end of the cycle.
Is the door locked and the Add A Garment light on?
If the Add A Garment light is on, then the washer door will unlock after the Pause/Cancel button is pressed once. Pressing the Start button will restart the washer at the same point where it left off in the cycle.
Is the door locked and the Add A Garment light off?
If the Add A Garment light is off, then the washer door will unlock after the Pause/Cancel button is pressed twice. The door will not immediately unlock while the cycle is running due to a possible high-water level in the washer, high-water temperature, tumbling or spinning. It may take up to five minutes for the washer to stop spinning and draining before the door will unlock. You will hear the door click when it unlocks.
If Pause/Cancel does not work:

1. Unplug washer or disconnect power for one minute.
2. Plug in washer or reconnect power.
3. Re-select the cycle and press Start.

NOTE: If the error remains on the display, call for service.