Teka Dishwasher sticking on programs

Hi
My Teka Dishwasher is behaving very oddly. It doesn't seem to finish properly. I've changed the programme controller but if anything its worse. It just stops and waits mid program. I've cleaned and even removed the inlet filter (wasn't dirty anyway) with no effect.
I'm also not sure how to reset it either?
Does anyone know what causes behaviour like this?
Model TDW 59FI
Thanks
Scumbag Adie
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Colder water taking longer to heat ? Pump stuck or blocked ? Waste pipe hose blocked ? Thermostat faulty ? Heating element faulty ? Synchronic motor on the timer unit faulty ? Internal filter blocked ?
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** Not sure if water taking longer to heat ** When it does work water seems to get thrown around ok and drains
Its difficult to tell when its ready to attempt a new cycle. Rotating the programmer by hand gets it to the "finished cycle" type of light display but then attempting another cycle it doesn't even start - light goes out to indicate it has started though. Anyone know the exact position the programmer should be set in at the start of cycle?
There is also a strange looking microswitch underneath with some kind of polystrene diafram and hose attached to it, what does that do?
Could the salt system have something to do with it. It doesn't seem to use much salt recently. One half of it is filled with brown gundgy looking stuff and the other has some salt in it.
It seems to get stuck at random places if that gives a clue?
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Sticking in random places during the wash cycles usually means that the system needs cleaned of all the gunge in the pipework inside. The sticking happens because the wash cycle heats any solid fats and things until they become liquid(ish) again and move further along the pipework before going solid again. So it might be time to strip it all down and give all the pipes a real good clean with boiling water and vinegar solution. The vinegar helps to clear the fatty deposits when the boiling water melts it.
Make sure to clean all the pump, salt and rinse aid chambers as well. This ca be done with a cooler solution of water and vinegar, and get as far inside them with a cloth or pipe cleaning brush if possible.
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