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Re: error code A04
A04 = Unable to sense/reach temperature in 70mins. - machine drains until Level Switch resets + 1 minute
First, open the door and look into
the tub and locate the heating element (if it is covered, remove
the lower dish rack and cover). The heating element has two terminals
which extend through the bottom of the tub, note the general location
where they go through.
To access the heating element's
wiring, remove the front panel located beneath the door. The panel
is usually held in place with two screws either above or below
the panel. It may be necessary to first open the door to the dishwasher
to reach the screws over the panel, then close the door to remove
the lower access area and locate where the terminals come through
the tub. Each terminal has a wire connected to it. Label the wires
and the terminals so that they can be properly reconnected. Pull
the wire off of each terminal; they are connected with a slip
on connector. Firmly pull the connector, do not pull on the wire.
You may need to use a pair of needle-nose pliers. Inspect the
connector and terminal for corrosion. If either is corroded they
should be cleaned or replaced
Each terminal is secured with a
lock nut, use a crescent wrench or pliers to loosen the nut. Remove
the two lock nuts. From inside the tub, lift the element out.
Position the new element over the holes and set it in place. Replace
the lock nuts and reattach the wires. Replace the access panel,
the element cover, if any, and restore the electricity.
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This seems related to the heating sensor or the element both of which can be easily checked out., You need a multimeter in OHMS range to check the continuity of the element , if open the element must be changed. If the heating element works then the wash must heat if not there is no supply from the program controller unit. If there is no control of heat then the sensor also must be checked.
You can do this carefully by disconnecting the mains power and checking using a multimeter.
Turn off the water and electric! Its really easy to change the heater element, once you have taken out the dishwasher!, remove the bottom panel and remove the wiring to the element, slacken off the nut under the electrical contacts voila!, also it may be a faulty thermostat that you cannot reset and has to be replaced, I would do this at the same time, as again its easy with the bottom off.
The LG 5811 dishwasher would display the error "tE" if the thermistor has failed. Not seeing an error could mean that the controller card (PCB) has failed. Hard to tell if the heating element has failed or wiring has shorted.
To look a little further, you can see (but not remove) the heating element by removing the filter in the sump area beneath the bottom rack. Disconnect dishwasher from power first and inspect for obvious failure of element.
Gaining access to the heating element is very complicated on the LG units. You have to drop the entire sump unit after turning the dishwasher over on its top.
Recommend a service call.
bosch dishwashers run the cycle through the heating element, you may get a 2H displayed. when you wee that it means the heating element is bad, or the board is bad, i will tell you in my 15 years of repair its almost always the board,. if you know someone who is solder literate, the you can remove the board and resolder the connection. you need to remove the screws on the inside top of the door to remove the display panel, after doing so you will see the control board(fisrt turn off the electrical) then remove the wiring harnesses from the control board, the harneses only go in a certain slot so they will be easy to remember where to put back into.open the case of the board, look on the back and you will see where the bad solder joint id...clean, resolder, reinstall......good luck. please check this first before trying to change the element. you have to take the dishwasher out and flip it over to change the element
you may have a bad heating element..or temperature sensor the water temperture is not getting hot enough to let the dishwasher run. you my reset it and try running the water in the sink until it reaches hot ... then try stating the dishwasher...let me know if this helps