[wallynyc]

Re: Diplomat 8242 not heating water – where’s the element?

Thanks to all for the tips & advice about the heating problem I had.

I fixed it – and it was less trouble then I thought. Found on the solder side of the PCB that one of the relay output pins (on the side of the relay which switches the heating element on) had a very badly soldered connection – almost completely dry of solder. Buzzing out the connection between this pin and the heating element showed a completely open circuit. So after re-soldering it, continuity was restored. Fired up a normal wash cycle and it worked fine. I now have a fully working dishwasher again 😀

Thanks again & I hope this fix information helps someone.

[wallynyc]

Re: Diplomat 8242 not heating water – where’s the element?

Thanks for the pointers Dave – I’m assuming 100 Ohms or less indicates the element is OK when the meter is applied across the element terminals when the 2 wires connecting to it are disconnected (element out of circuit)?

Now I feel slightly ridiculous. I’d taken it for granted that it was an ADP 8242 model – from the user manual that was left with it. After all, everything in the user manual matched what I saw within the dishwasher. Further investigation revealed it is in actual fact an ADP 8902 model….. 😳
So the fact I couldn’t find anything in my machine that resembled the heating elements displayed on various online spares supplier web-sites for the 8242 model makes sense now. I was looking at the wrong machine type. Idiot 😡

So I now know that the cylindrical ‘part’ which forms part of the water feed to the input side to the motor is in fact the heating element. At least I can now ask questions which actually refer to my dishwasher model.

I’m more than comfortable with electricals, electonics, DVMs, soldering/desoldering & component replacement. My specific question would be;

On the ADP 8902, the heating element connects to the electrical system of the unit with 2 wires, a brown and a blue. The brown (I assume is +v DC) appears to connect straight to the control PCB and the blue (I assume 0v or -ve DC) connects to the airflow (?) sensor switch – the round thing with an airflow tube between it and the sump. This airflow switch must then have to be in a non-fault-state in order to pass the current through it and complete the DC current loop (to 0v DC at this point or ‘through’ the next sensor, etc., and eventually to 0v)

So 2 conditions must be met in order for current to flow through the heating element (1) The brown wire must have voltage applied by the control PCB at a certain point in any wash cycle and (2) the airflow sensor – and any further downstream sensors must not be in a fault state.

To help me to diagnose the fault area, what is the DC voltage applied to the brown wire from the PCB when it activated the heating element? This will give me a clue as to what to look for at the various stages of the wiring.

And does anyone have a wiring diagram for a ADP 8902?

Thank you,
David

[Author]

Posts