I have a Bosch dishwasher (model
SHX46A05UC/43) that occasionally fails to get all the soap scum off of the dishes. It seems like it fails to fully finish cleaning once every five to ten cycles.
I feel like it might be something to do with the heater. The cycles the dishes do get fully clean, the dishes are almost too hot to touch at cycle end, while following cycles where the dishes are not fully clean, the dishes are only warm.
The heater is capable of working, as during testing I observed water temperatures around 150°F mid-cycle.
Things I have confirmed:
- Pump: Opening the dishwasher while it's running shows the arms spinning and spraying. Water fully is removed from basin after the cycle is finished
- Arms: I have removed and cleaned the arms and they don't seem to be clogged.
- Traps and drains: appear to be cleaned are not gunked up.
Can anyone suggest what might be wrong? The inconsistency in the issue is making it hard to track down.