Jan 152011
 

This is a very well known issue with Bosch dishwasher. Having repaired this issue myself over and over, I know this dishwasher and error well. Appliance repair companies have made thousands off just this repair alone.

Bosch dishwasher with the code 2H displayed in the digital read out will more than likely need the main control replaced #266746. The 2H means there is a heating issue, you need a multimeter to diagnose properly but here is a tale tale sign the board is bad.

Remove the dishwashers control panel, do so by removing the screws around the door, Bosch uses torq head screws on most of their appliances.

With the screws removed the control panel will release and fall forward, you will need to UN clip the control board from the plastic housing. On the bottom of the control there are several locking tabs, depressing them with a small screwdriver will release the board from the housing.

With the dishwasher control removed you can now open the plastic housing, the heater relay will be burnt, look for the missing or black solder mark on the board.

I have heard mixed reviews on soldering the control, sometimes it lasts most times it fails right away, I always replace the board its a sure fix.

Note also the thermostat located on the bottom side of the unit could also cause this error code, testing the thermostat with a volt meter should be done before purchasing any parts.

Jan 152011
 

Several factors can contribute creating a no drain issue. Bosch dishwashers have what is know as an auxiliary drain pump. This pump is not part of the main wash system, the drain pump is located on the bottom left side of the sump housing.

Pushing the locking tab in and rotating will release the drain motor from the housing. You will need to do this if the drain pump is found defective or if foreign debris is lodged inside.

Several possibilities for a no drain issue include:

-Clogged drain hose

-Kinked drain hose

-Failed drain pump

-Disposal or standpipe adapter clogged. Often installers will install make shift candy canes for the stand pipe, when doing so they use a smaller diameter pipe, food and debris often become stuck inside.

If determined the drain pump needs to be replaced or cleaned you will need to access it from the front, disconnect power and remove the lower kick plate two screws hold it on.

With the dishwasher kick plate removed you will see the pump on the left side like stated above depress the locking tab and rotate the pump to remove. Before removing the kick plate you can access the dishwashers drain pump from the top, you can not remove it but you can clean it.

Access the dishwasher pump from the top by twisting the filter located in the bottom dishwasher, remove the metal screen. Removing the screw over the drain pump access cover may reveal the issue. Cleaning the drain pump from the top with needle nose pliers may help aid in lifting small obstructions out of the way.

After repairing the dishwasher whether replacing or cleaning the pump, you can set the dishwasher to a normal cycle and let fill, once filled hold down the corresponding drain/cancel buttons and the dishwasher will go into a 2 min drain cycle.

Jan 152011
 

Bosch dishwashers are built with flood switches located in the bottom base pan of the dishwasher. The flood switch is connected to a rod that activates a small interlock switch, when water enters the base pan on a Bosch dishwasher a Styrofoam puck lifts the rod activating the flood switch.

When the flood switch is activated the dishwasher will go into a no fill,  only drain mode, the drain motor may also run with the door open to the unit, this is a sign there is water in the base pan.

Determining where the water entered the base pan can often times be time consuming. Bosch dishwashers have a more complex wash and dry system, more parts this mean smaller work areas, some parts are in sealed compartments, these require lots of time and effort to access.

You may have to watch the unit through a complete cycle before you can diagnose the error. Some of the more common possibilities include

-Sump fill hose (Cracked/brittle)
-Drain hose(Also check drain hose connection)
-Faulty drain pump seal
-Circ pump housing’
-Main sump seal

Any one of these are a possibility and there are many more, spending an hour watching the unit cycle may be the only way to figure out where the water is coming from.

Note also over sud-sing will also cause the unit to leak water into the drain pan. If you recently filled the dishwashers jet dry dispenser, excess jet dry on the door and surrounding areas could create the dishwasher to flood into the pan.