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A Zanussi ZDT21006FA dishwasher is going through salt. I can fill the sump up and it’ll be gone in days. I’ve inspected the cap and gasket, that was fine.
I’ve had the solenoid out, checked the coil with a meter, have continuity, so cleaned out the plunger and spring, put it back, but it’s still using too much salt.
I don’t understand how it’s all meant to work, ideally a service manual would be great, so that I can see how the switching works, as to ground I’m getting 240v on both contacts, so is it switched on the -ve?
Any suggestions would be great, thanks.
9 different versions of a ZDT21006FA so would need the product code /pnc number which begins with a 9.
Would of thought there are going to be only 3 things that will screw up to cause this 1) the salt pot cap is faulty (which it usually would be) 2) the valve on the salt pot unit (is only available with a complete salt pot unit at about 83 quid) unit receiving voltage 2 lives on both solenoid tags is normal when the valve is not to be operated with the switching to a neutral via the pcb to make the solenoid work when the time comes in the cycle to open. So that looks ok from what you say 3) problem with the water distrubution chamber (l/h/side behind the metal side) could be the problem but usually its internal air break that gets blocked up or part blocked up allowing water via the rear i/let solenoid to go through the matrix very slowly = slow fill, if so it is a fanciful long shot that the “trapped water” might bleed through the salt pot`s valve. The side chamber / resevior is part 8581170481874 and is a surprising 12 quid but will need checking based on the pnc, I just picked a pnc code out at random. Go see Zanussi uk spares.Hi, thanks for your response, our dishwasher PNC is 911 539 205 00.
Ok, so sounds as though the voltage is correct then. So I guess with the voltage on, the plunger is pushing towards the salt pot?
So it sounds as though I’m going to have to do a big strip down to replace the pot if that’s what I do?
Thanks.
There are 2 valves. 1 valve lets the water in to fill the machine and is located at the rear of the machine and t`other valve which we are talking about is on the salt pot, part number 1561247204 £83 as the whole salt pot / softener unit i.e. comes with the valve. When the salt pot solenoid gets a live and a neutral the plunger within the valve is triggered open to let the trapped water run through it by gravity from the side water chamber part number 8581170481874 £12.
Why don`t you do this, because changing the soften/salt pot unit is a pain undoing the large plastic nut without the right tool and its an expensive part, first to prove a point: remove the l/h/side cover, put the machine on and choose a programme and watch the machine fill through the side chamber because as it fills there should be water going into another section of the side chamber which should remain trapped there (until such time the solenoid on the salt pot is triggered to let that water go through the salt pot and hence through to the softener crystals). If the trapped water disappears as it is filling the machine up or disappears shortly in a minute then the saltpot unit needs to be changed.
It could be still a salt pot cap which is not listed as coming with the new softener unit (for some daft reason!) so you might want to get that first to try. If you are then sure the softner valve is the culprit then do battle!
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