How to mend it .com - Bosch dishwasher SGS43A12GB-27 does not stop filling
I repaired a leak in the sump unit that was causing the base to fill with water. This is now resolved but now the cold feed does not stop at the start of the cycle and so the machine continues to fill unitil I intervene. I can force a pump out by tripping the float switch in the base. Also the main float/pressure switch trips the limit switch as the machine fills but does not stop the feed. The limit switch itself is making/breaking electical contact OK. Can you suggest a possible fault or the next diagnostic step I should take?
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E15 on the Bosch units indicated the base switch is activated. There is a safety switch which will activate the drain pump to avoid the base overflowing. Basically you either have a leak or possibly rodents living in the base of your dishwasher.
Easy way to check is first make sure no water is inside the washing area or sump (where the filter is). You will have a dribble there which the drain pump won't pump out but make sure it is mostly empty. The dishwasher always drains at the beginning of a cycle if you need to manually activate this, just turn you tap off so it doesn't try to fill. unplug your dishwasher then pull the machine out and place some old towels along the base and tip if forward. If water run out from the base then you got a leak.
If you are a bit handy then you can take either the front kick plate and cover off or a side panel to look in the base. The float switch is a polystyrene disc which raises and hits a micro switch when the base fills up.
Common place for these to leak is the sump, wash motor or water path / distribution unit. Look for chalky white residue around the seals. Depending on the age of your unit some parts are more serviceable than others. Bosch are pretty good with spare parts so you should be able to source most items you need.
If you are not handy or technical and are concerned about taking on this work, call in a technician. Remember disconnect power before attempting any work. please.
If you have water filling up in the sump, you will get that scenario. If water is out of the tub, pull unit out and tilt backwards about 45 degrees. If water comes out from the base(sump), then you know you have a leak and need to have it attended to. Note, if water does come out when tilting the machine backwards, you will find it will work again until base is full again.(Switch off before tilting the machine backwards just for safety.
the unit is going into drain mode. check your hose for leaks. when water leks in the base of the unit the float switch is activated and the unit will stay in drain mode until the water is removed. check float by removing side panel and look into bottom base for water.
Sounds like flood switch has been activated. They have a float in the base of machine, which will activate drain pump if a leak has occurred. Unplug from power- remove right hand side panel, check to see if any water in base. If so, leak has occurred. Clear water from base and test run to locate leak
several poss faults tap turned on? if so probably the unit needs to have the meter tank and feed piping cleaned out. if this is all clean then it could be either the water valve is faulty or you have a leak into the base and the unit will not fill up when it is in "flood mode". (check this out by tipping machine to the side and see if any water pours from the base).
On bosch dishwasher if the base senses a water leak the unit will not
fill & the drain pump will come on. I recommend checking for water
in the base & locating the source of the leak if you see water in
the base. Other possibilities; fill switch, water level switch or water
valve. There is no reset for this problem.
It sounds to me like the base safety float has been activated. This will cause the unit to cancel the program it is in and activate the drain pump, hence the "run" that you hear, but no water.
You need to remove the lid and two side panels. If you see water inside the base, you know that the safety float switch has been activated.
Remove plug from outlet and empty water from base (by tilting to left side and using sponge to syphon water)
Restart unit and check where water is leaking from. Usually from a filling hose not correctly/tightly fitted; leaky inlet valve; leaky heater asembly.
Hope this helps!