Hotpoint sdl510 all three lights on delayed start flashing. It won't press start an water not drained from last cycle

That sounds like you are on Pause or Delayed Start. Try Pressing and holding the button. You can also try disconnecting from the mains for 5 minutes.

When in doubt, read the manual :>D

START/PAUSE button with indicator light: starts or temporarily interrupts the wash cycles. N.B. To pause the wash cycle in progress, press this button; the corresponding indicator light will flash orange, while the indicator light for the current wash cycle phase will remain lit in a fixed manner. If the DOOR LOCKED indicator light is switched off, the door may be opened. To start the wash cycle from the point at which it was interrupted, press this button again.

and also

! If the START/PAUSE indicator light (orange) flashes rapidly at the same time as the function indicator light, this indicates a problem has occurred (see "Troubleshooting").

https://manualzz.com/doc/50330217/hotpoint-fdl-9640p-uk-instruction-for-use

..

replace the motors brushes check the filters
and clear any bits of bra wire etc

then reset the machine {usually hold power in and apply the mains}

Engine fault or main board fault. Most likely main board.
Check cable harness from main board to engine. Check the carbon brushes on the engine. If its all okay, replace main board

Make sure the door is completely closed and latched. On models with a dual-digit display, the control displays "- -" during a cycle if it believes the door is not latched. Check for obstructions (spoons, etc), interfering with the door operation. A lower dish rack that is installed backward will also cause incomplete door closure.Is there power to the dishwasher Check your household electrical box to see if a fuse has blown or if the circuit breaker has tripped. If the unit has a plug-in power cord, make sure it is plugged in.Does your dishwasher have a rotary timer knob? (Some Models)The cycle selection must match the position of the timer knob. Turn the timer knob to the beginning of the preferred cycle. The timer knob should click when you reach the start of the cycle.Is the control lock option activated?Press and hold the Heated Dry option (button with lock icon) for three to five seconds and the light should turn off. Instructions are also placed on the label on top of the inner door to unlock the controls.Is the delay start option activated?To cancel the delay and cycle, press Cancel/Drain.Has the motor stopped for less than 10 minutes?
The motor may have stopped due to an overload. If this is the case, the motor will automatically reset itself within 5-10 minutes.Is the Start/Resume indicator flashing?Opening the door or interrupting the power can stop the cycle. Close the door and press Start/Resume. If the Start/Resume indicator flashes three times when you press Start/Resume, the dishwasher is waiting for you to open the door after the last cycle. Open and close the door, and then press Start/Resume.On models where the controls are on top of the door be sure to close the door within 3 seconds of pressing the Start/Resume to start or resume the dishwasher cycle.Is the water shutoff valve (if installed) turned on?Make sure that the water shutoff valve is turned on

Dishwasher will not start Is the door open or unlatched?
Make sure the door is completely closed and latched. On models with a dual-digit display, the control displays "- -" during a cycle if it believes the door is not latched. Check for obstructions (spoons, etc), interfering with the door operation. A lower dish rack that is installed backward will also cause incomplete door closure.

Check your household electrical box to see if a fuse has blown or if the circuit breaker has tripped. If the unit has a plug-in power cord, make sure it is plugged in.

Does your dishwasher have a rotary timer knob? (Some Models)
The cycle selection must match the position of the timer knob. Turn the timer knob to the beginning of the preferred cycle. The timer knob should click when you reach the start of the cycle.

Is the control lock option activated?
Press and hold the Heated Dry option (button with lock icon) for three to five seconds and the light should turn off. Instructions are also placed on the label on top of the inner door to unlock the controls.

Is the delay start option activated?
To cancel the delay and cycle, press Cancel/Drain.

Has the motor stopped for less than 10 minutes?
The motor may have stopped due to an overload. If this is the case, the motor will automatically reset itself within 5-10 minutes.

Is the Start/Resume indicator flashing?
Opening the door or interrupting the power can stop the cycle. Close the door and press Start/Resume. If the Start/Resume indicator flashes three times when you press Start/Resume, the dishwasher is waiting for you to open the door after the last cycle. Open and close the door, and then press Start/Resume.
On models where the controls are on top of the door be sure to close the door within 3 seconds of pressing the Start/Resume to start or resume the dishwasher cycle.

Is the water shutoff valve (if installed) turned on?
Make sure that the water shutoff valve is turned on.

Do the diagnostic test:
SHU 53 MODELS

To start test program, press and hold both SCRUB WASH and DELICATE/ECONO program buttons, then turn unit on by pressing ON/OFF button. Initially, control module version # will be displayed (e.g./ ?21? = version 1 with jumper). When wash program buttons are released, lights above them will flash. To end test program, press ON/OFF button.
To check each program indicator light, press its button. To check Cycle Countdown display, Refill Rinse Agent light and REGULAR WASH light, press REGULAR WASH button (press Delay Start button to test Cycle Countdown display alone). Cycle Countdown display will show “88′ when REGULAR WASH button is pressed and “8h” when Delay Start button is pressed.
To start testing, press both the SCRUB WASH and DELICATE/ECONO buttons a second time. When testing has ended, Cycle Countdown display will show a fault using codes below. If more than one fault occurs, code numbers will be added together, (e.g./ ?6? = faults 2 + 4).
0 = No faults detected 2 = Heating fault 8 = NTC (temperature sensor) fault
1 = Aqua Sensor (“Sensotronic”) fault 4 = Filling fault F = Filling fault (display occurs during wash, not test)
To check for heater, high limit or flow switch problems, start testing until heating starts. Using a meter with a current coil, measure current going into dishwasher. If current is ~ 11 A, then heater, high limit and flow switch are OK. If current stays at ~ 1.5-2 A, then heater, high limit or flow switch are faulty.
If water level switch (f1) has failed (opened), display will show fault code “4′ and unit will continually fill and drain where testing won’t be completed. If flow switch (e5) has failed (opened), display will show “0′, water won’t heat (to 150?F) and water won?t stop circulating. If NTC probe (f2/f4) has failed (opened), display will show fault code “8′ immediately and testing will end shortly after water has started circulating.
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The dishwasher not draining is most probably faulty drain pump or drain hose is got bit loose.It has to be checked and confirmed
.You can get required parts from www.repairclinic.com
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

1. To cancel the delay.press the delay pad again when the delay is counting down. The indicator light will go out and the cycle will start or resume immediately.
2. To cancel the delay and the cycle, press Start/cancel once to drain and turn-off the dishwasher.
3. Press Start/cancel twice to turn-off the dishwasher without draining.
   

SHU 53 MODELS To start test program, press and hold both SCRUB WASH and DELICATE/ECONO program buttons, then turn unit on by pressing ON/OFF button. Initially, control module version # will be displayed (e.g./ ?21? = version 1 with jumper). When wash program buttons are released, lights above them will flash. To end test program, press ON/OFF button. To check each program indicator light, press its button. To check Cycle Countdown display, Refill Rinse Agent light and REGULAR WASH light, press REGULAR WASH button (press Delay Start button to test Cycle Countdown display alone). Cycle Countdown display will show ?88″ when REGULAR WASH button is pressed and ?8h? when Delay Start button is pressed. To start testing, press both the SCRUB WASH and DELICATE/ECONO buttons a second time. When testing has ended, Cycle Countdown display will show a fault using codes below. If more than one fault occurs, code numbers will be added together, (e.g./ ?6? = faults 2 + 4). 0 = No faults detected 2 = Heating fault 8 = NTC (temperature sensor) fault 1 = Aqua Sensor (?Sensotronic?) fault 4 = Filling fault F = Filling fault (display occurs during wash, not test) To check for heater, high limit or flow switch problems, start testing until heating starts. Using a meter with a current coil, measure current going into dishwasher. If current is ~ 11 A, then heater, high limit and flow switch are OK. If current stays at ~ 1.5-2 A, then heater, high limit or flow switch are faulty. If water level switch (f1) has failed (opened), display will show fault code ?4″ and unit will continually fill and drain where testing won?t be completed. If flow switch (e5) has failed (opened), display will show ?0″, water won?t heat (to 150?F) and water won?t stop circulating. If NTC probe (f2/f4) has failed (opened), display will show fault code ?8″ immediately and testing will end shortly after water has started circulating.

If the clean light flashes 7 times, pauses, then repeats...

When the dishwasher doesn't sense a water temperature increase, it will stop working and lock the functions (clean light flashes 7 times, all buttons are non responsive). It does this as a safety in case the element is broken and feeding electrical current into the water.

To resolve this you will have to reset the console. Do this by closing the door and press these buttons in sequence...

-high temp wash
-heated dry
-high temp wash
-heated dry

...all the lights will turn on briefly and the machine will start a diagnostic cycle. You can press cancel or let the diagnostic cyle finish (1-2 minutes).
You should now be able to run the dishwasher as normal.

If the issue returns, you could have a problem with the heating circuit (ie. element, thermostat or wiring). It rarely happens but it could also be the door switch not engaging properly when the door is closed (slightly bend the door latch down making sure it doesn't hit the door when you close it).

is the cean light blinking 7 times and then repaeating?? If so this is a water heating fault and means that the computer sensed that the water temp didnt rise just 3deg in the last main wash cycle. If its not blinking 7times then repeat, it sounds like the user interface (membrane switches) have failed. Let me know more and i can help.