Zanussi zdt 6764 built-in dishwasher. no hot water and no heat during drying, the machine goes through it's whole cycle with no error codes visible . I have already changed the element , what'

Could be anything!
If you suspect that there is a fault then it will be displayed by blinking LED "END OF CYCLE". As the display of failure in hexadecimal code it can flash up to max. 15 times than short pause and after that repeat fault code. You must to count the number of times the LED "END OF CYCLE" flash up.

Example from user manual: Anti-flood device is activated.
- continuous flashing of the indicator light of the running programme
- 3 intermittent audible signals
- 3 flashes of the END OF CYCLE indicator light
(which means "i30" fault code, the cycle is interrupted and the
drain pump switches on).
Possible causes:
Water leakage from the tub - sump and various connections
(pump, upper spray arm duct etc.); floating sensor blocked
mechanically; microswitch faulty; fill solenoid blocked
mechanically; circuit board faulty (solenoid triac short-circuited);
wiring faulty.
Could be also:
To cancel a washing programme in progress:
- Open the dishwasher's door.
- Press the programme selection/cancel button for about 3 seconds,
until the indicator light of the running programme turns off and the
END OF CYCLE indicator light flashes, indicating that the running
programme has been cancelled and that the machine has
returned to setting mode. It is now possible to select another
washing programme. If a new washing programme will be
selected, check that there is detergent in the detergent dispenser.

NOTE: only during the drying phase, if the dishwasher's door will be opened and remains open for more then 30 seconds, the running programme will be automatically cancelled and the machine will return to setting mode. This will happen, always only during the drying phase, also when the machine is switched off by pressing the
On/Off button and remains switched off for more then 30 seconds.

Dado

Element should be underneath the unit. You will need to disconnect the unit, to work on it.

Try cleaning all the jet orifices in the rotating vanes. Use tooth brush. Check for dish plate is touching the rotating arm in the wash chamber. Rotate by hand for freeness.

Does your dishwasher have a built in disposal?

Replace the timer.

Most likely it was broken by someone resetting the timer by hand while the unit was energized.

Always open the door(de-energizes the timer) when you want to make an adjustment to the machine while it's running.

not familar with the code but usually wash has a built in thermo stop to wait for water to heat to correct temp,if it works normally in a rince cycle and spins out and finishes properly i would look at heat element or stat,hope this helps

Hello
ALARM CODES

E11 Problems with water fill in wash phase E10 Cycle PAUSED 8.2
E12 Problems with water fill in drying E10 Cycle PAUSED 8.3
E21 Problems with water drain in wash phase E20 Cycle PAUSED 8.4
E22 Problems with water drain during drying or drying
condenser blocked E20 Heating phase skipped 8.5
E31 Analogic (electronic) pressure switch circuit faulty --- Cycle blocked
with door closed 8.6
E32 Incorrect calibration of analogic (electronic) pressure
switch --- Cycle PAUSED 8.7
E33
Incongruency between level of analogic (electronic)
pressure switch and level of anti-boiling pressure
switch 1
--- Cycle blocked
with door closed 8.8
E34 Incongruency between level of electronic pressure
switch and level of anti-boiling pressure switch 2 --- Cycle blocked
with door closed 8.9
E35 Water level too high --- Cycle blocked with door
closed and water drain 8.10
E36 "Sensing" circuit of anti-boiling pressure switch 1 faulty --- Cycle blocked
with door closed 8.11
E37 "Sensing" circuit of anti-boiling pressure switch 2 faulty --- Cycle blocked
with door closed 8.11
E38 Pressure chamber blocked --- Heating phase skipped 8.12
E41 Door open E40 Cycle PAUSED 8.13-14
E42 Problems with door closure E40 Cycle PAUSED 8.15-16
E43 TRIAC which powers the door interlock faulty E40 Cycle PAUSED 8.17-18
E44 "Sensing" circuit of door delay interlock faulty --- Cycle blocked 8.19
E45 "Sensing" circuit of door delay interlock triac faulty --- Cycle blocked
with door closed 8.19
E51 TRIAC which powers the motor short-circuited --- Cycle blocked with door
closed (after 5 attempts) 8.20
E52 No signal from tachometric generator --- Cycle blocked with door
closed (after 5 attempts) 8.21-22
E53 "Sensing" circuit of motor TRIAC faulty --- Cycle blocked
with door closed 8.23
E54 Relays (motor) contacts faulty --- Cycle blocked with door
closed (after 5 attempts) 8.23
E61 Insufficient heating during washing --- Heating phase skipped 8.24
E62 Overheating during washing --- Drain, end of cycle 8.25
E63 Insufficient heating during drying Heating phase skipped 8.26
E64 Overheating during drying --- Heating phase skipped 8.27
E66 Power relay to heating element faulty --- Drain, end of cycle 8.28
E71 NTC wash sensor faulty --- Heating phase skipped 8.29
E72 NTC sensor on drying condenser faulty --- Heating phase skipped 8.30
E73 NTC sensor on drying duct faulty --- Heating phase skipped 8.31
E84 "Sensing" circuit on circulation pump triac faulty --- Drain, end of cycle
(door open) 8.32
E85 Circulation pump faulty --- Drain, end of cycle
(door open) 8.33
E91 Communications error between main PCB and user
interface --- --- 8.34
E93 Configuration error E90 Cycle blocked 8.34
E94 Incorrect configuration of washing cycle E90 Cycle blocked 8.34
EF1 Drain filter blocked LED-EF0 --- 8.35
EF2 Excessive detergent LED-EF0 --- 8.35
Regards David Marsh

is your water temp set at 120 degrees

I had the same problem with Zanussi ZDT 6252. To fix it, turn power on, close door fully, then open door, turn off then turn back on again. If you follow this sequence the machine is reset and you can select programs again.

A technician told me that the dry cycle depends on the heat from the water during the wash cycle. If your water heater is far away from your dishwasher, turn on your tab at the sink and make sure the water is hot before you start your dishwasher. Otherwise, the dishwasher is using cold water and thus when it gets to the dry cycle, the dishes won't dry.