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Bosch SMV40C30GB dishwasher. Came up with the E25 fault. Drained all the water, took the white cover off to inspect impeller for blockages nothing, refitted the cover and ensured it was clipped in correctly. Checked sink waste for blockages, nothing. Disconnected pretty much every pipe on the dishwasher and to the sink, blown down them to ensure no restriction, nothing.
So then I moved onto checking the drain pump. Tested with multimeter 3 terminals on it, measured across them all and all readings 93 ohms which I would think is fine. Decided it was worth just replacing in case it was mechanically damaged to see what happens. Ordered and fitted and no change.
the fault is strange it seems to do a few very short burst of attempting to pump but it doesn’t seem to have enough power behind it and not run the pump long enough to drain anything. If I manually drain the water from the machine and then run it the pump it actually seems to work as expected with pretty long periods of running but any water or resistance it won’t.
I’ve also lifted the polystyrene float to attempt to activate the pump, E15 is displayed but the pump doesn’t run either however looking online the pump should run permanently with this fault.
so I moved onto replacing the main PCB, found one on eBay from an identical donor machine for £25, ordered and fitted and still no change, does exactly the same thing. Obviously it’s possible the 2nd hand board could be faulty but you wouldn’t expect it to do the exact same fault as my old one which leads me to think there is something else I’m missing.
I have also ensured the non return valve just after the drain pump in the pipe is clear and does actually open which it does.
I have taken the water tank off the side and cleaned that out as there was a bit of black build up in an air break which looks connected to the drain outlet side but again made no change.
Any other suggestions?
this is not an uknown problem but it is one with no common solution
first off you got a new board but there are 10 machines starting SMV40C30GB and the will most likely have different software but since it has the same problem as the old board then i wouls say it cant be the problem or at best its unlikely
the pump on these machines act as a sensor and the timer measure the work done to determine if its empty. it is possible the pump could be the cause. you could remove it and check for shaft play
but in the end you have to change it to find out if its the cause or not
Dave
Hi Dave, have already put a new pump on and did the same thing. I should’ve said both my machine and the donor machine on eBay are SMV40C30GB/41’s. Don’t want to replace the dishwasher as it’s not very old but can’t think of what else could be wrong with it at this point and now I’ve become so invested in it really want to find out what’s wrong with it for my own sanity.
well e25 is the code for blockage
have you checked the non return valve on the pump outlet
are you using an over long drain hose or set too high as this can cause problems
Dave
I’ve had the sump pipe of underneath and poked the non return valve and it seems to move and open freely and there’s nothing obstructing it.
I do have the waste pipe extended as the dishwasher is a couple of units away from the sink. I have had it like this for 3/4 years since it was fitted but I did take this extension apart and try and drain it into a bucket to eliminate this being the problem and it still won’t pump it out.
I also disconnected the sump pipe from where it goes into the plastic tank at the side, held the pipe into a bucket to make sure there was nothing after that blocking it but it still won’t drain just trickles out 3/4 times as the pump attempts to kick in.
Ok so let’s start at beginning what was the part number for the drain pump? It should be 00631200 there are pumps that look the same but don’t fit, and for it to drain the heat pump needs to run briefly to let the drain pump there is still water in the tank, Part number for heat pump is 00755078. Also the machine that you had a spare pcb off must have a fault
Right so the drain pump was indeed part number 00631200 bought direct from the Bosch parts site. If I drain the water myself manually and run a program the drain pump kicks up and sounds normal, then it sounds like you said the heat pump motor runs then ramps up and stops. The machine then fills and washes but won’t drain. The PCB could very well be faulty but it seems too coincidental that it would have the exact same fault as my original.
If the heat pump was faulty and somehow not sensing the water in the tank would it still wash?
Yes it should do but there may well be a restriction in the heat pump these dishwashers work on the following drain pump runs briefly heat pump runs briefly small amount of water in then a pause then same sequence but heat pump has 3 different speeds to go thou then it will start to fill and go through wash sequence, just wondering the new pump was it in a brown box or in a bubble wrap bag?
Are there any further suggestions worth trying? Would it be worth getting a new heat pump and trying it despite it appearing to wash fine? Looking online there seems to be nothing documented about this specific fault as such.
This is noe of those faults with no actual known cause. had a few people with this one but changing components on the hope of curing gets expensive. you could check wash motor for blockages. you can either remove it or its sometimes possible to see it with a mirror from the sump
Dave
Had the heat pump off, can’t see anything in there blocking it and if I get a screwdriver into it and turn the impeller it turns freely so unfortunately I don’t think it’s that. Do you know if it’s possible to access a service manual for this machine or a similar model? Would be interesting to see what info they give in there if any.
closest manual i have found for these is below
Dave
https://www.manualslib.com/manual/2054908/Bosch-Ascenta-Shx3am.html#manual
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