Chosen Solution
washes with cold water only.it does not heat water
Open it. Look for the heater and measure its resistance. For a 230V Type ist should be near 24 Ohm, for a 120V Type around 10 Ohm. And: there is a pressure switch that ensures that the heater only works when there is enough pressure.
Hi - I was able to repair the Bosch dishwasher with this exact problem. It is an issue of the relay as described in this video: https://www.youtube.com/watch?v=Jb8gAnMb… You need to get an NTE R46-5D12-6 relay and replace it. Less than $5 part.
