2h error code on a amana dishwasher - Amana Dishwashers

SOURCE: Bosch Dishwasher Model SHU5316UC-06 -- what does

2H is not exactly an "error code", but it does indicate a problem. It means that the machine exceded its wash time by more than 2 hours. This is usualy caused by a failure of the heater, most often caused by a failure of the controll. Remove the control from the door, remove the plastic housing from the control, and check for a bad solder joint on the heater relay.
If you find a bad solder joint, REPLACE the controll.
Or call a qualified service person.

NOTE: The SHU53A dish washer with serial numbers from FD8205 to FD8507 are included in a factory recall. If your dishwasher is one of these contact BSH @ 1-800-586-9226 24/7.

SOURCE: What is error code 2H

My Bosch dishwasher did the same thing. When the wash cycle starts, the dishwasher fills with water and then the heater is supposed to turn on to heat the water. If the water does not heat, then it will display 2H continuously. The heating element may be bad, but a more likely cause is with the control module. Bosch has a problem with the control module printed circuit (pc) board that powers the heater on many models. The solution requires some technical expertise and soldering skills. The details are explained in the document "Bosch dishwasher troubleshooting tips" on page 11. Download here
Bosch recommends re-soldering the connection, which is a temporary fix. The problem is that the copper conductor (called a trace) on the circuit board is not wide enough to handle the current required for the heating element, and as a result the copper trace overheats, causing the solder to melt on the relay connection. The best solution is to remove the control module PC board and solder a short length of copper wire between the pins to prevent the overheating problem, as shown in the attached photo (magnified portion of PC board). I did this on my dishwasher and it has been trouble-free for over 3 years.