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Hi,
Here is a really corker! I have a somewhat old, but very good Miele G660 dishwasher. It has overheated its plug (but not tripped the RCD). When i put it on an extension lead with a thermal trip, it cuts out at two points in the washing cycle (start of the interim rinse and final rinse), so clearly at these points it is trying to draw too much current, but not enough to blow the fuse or trip the RCD. If i click the clock on, it works fine. Apart from this, it all seems to work perfectly.
In testing it, I disconnected the heating element and bypassed the temperature sensors and the clock ran through the cycle just fine, so i don’t believe it is the clock. I have checked what I can and have just replaced the heating element (although the old one seemed to have the correct resistance). This has not made a difference. I believe something is pulling too much current, which when combined with the heaters is enough to cause the issue. Therefore, my next thought might be the pump, but this appears to be working correctly. The machine is quite old, but it has been so good, I am reluctant to give up on it……any ideas anyone?Thanks
think we need to clear a few thing up here
you say you have a lead with a thermal trip. if it is as you say a thermal trip then it will have a current rating just like a fuse. it will trip if the current exceeds this rating. If yes what is the rating of this trip ?
what I think is more likely is its not a thermal trip but an RCD. If it is it normally has a test button. An RCD detects earth faults only and will not trip if it get overloaded. What this would mean is one of the components within the machine has an earth fault. I would check the heater first
Dave
Thanks for the response. It is connected to an extension lead with a 13 a rating (3120 watt). I had assumed the red reset on the lead was a thermal trip, as the main ring main red does not fail. I am also concerned that the original failure over heated the plug (partly melted) rather than blow the 13 amp fuse. I had dismissed the earth leakage option as it only happens at two points in the cycle and if I reset the trip on the lead and move the clock on, it works fine….????
don’t worry about the burnt socket had a few of them. provided the machine is a domestic model (some commercial units do draw over 13 amps) then the burnt socket is just a faulty plug and socket. Replace both with good quality components and make sure you cut any flexes or cables back to clean wire
Dave
I have replaced both and checked the cable, which appear OK. However, the cable and plug do get noticeably warm when the dishwasher is running. Could it be that the main pump winding has partly shorted, so that when it is running in conjunction with the heating, it draws too much current? If so, is there a way to check this?
no if main pump was faulty would overheat and trip out. cables do get warm in use especially when the heaters are on. main motor does not draw a lot of current so if it was over currenting it would get very hot and trip the internal safety stat in the winding
Dave
Dave, your a star. I have just measured the current through the cycle. The motor seems to draw around 5a and the peak with the pump and heater is around 11a. It doesn’t seem to get larger than that. I have just run it through a complete cycle (using it plugged directly into the new socket) and it has gone OK. I can only assume that the original fault was, as you say, a faulty connection in the plug/socket. The subsequent triping of the extension lead must simply be an over sensitive thermal trip. I will now run it for a while and keep an eye on it, but think it is probably OK.
Really appreciate your help, most grateful. The wife will be delighted I have put the new dishwasher on hold….
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