Question about Whirlpool GHW9300 Duet Washer
My washer sometimes gives an F11 error code-"serial communication error". It still works, but I'd like to resolve the problem before it breaks completely. Is this something I can fix? How do I start troubleshooting?
what model number are you having these issues with. I have a GHW9300. And how much was the replacement component?
Your F11 Code is stateing these things but if it is intermittent probabbly a loose connection.
Serial Communication Error
Communication between the Central Control Unit (CCU) and the Motor Control Unit (MCU) cannot be sent correctly.
Posted on Feb 10, 2009
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Posted on Jan 02, 2017
I believe EVERY machine will have this F11 error eventually. Here is what fixed mine. Remove the top cover by removing the three 7mm screws on the back of the machine at the top. Slide the cover to the rear and lift off. The CCU board has 2 relays on it. They have white plastic covers. One is labeled K4 and I believe the other is K2. There are five legs on each relay soldering them to the circuit board. Remove the circuit board from the machine. It is the one you can see with the top off in the back of the machine. Unplug all the connectors. Unsolder the 2 relays...brand name Omron. With a jewelers screwdriver carefully remove the plastic cover on the K4 relay. Examine the contact points on the normally open contacts and I will guarantee they will look dull and burnt. They should be bright and shiny. You can burnish the contact points lightly and clean them with electrical contact cleaner. If you take off the cover of the 2nd relay you will see the contact points are nice and bright and shiny. Swap the 2 relays and resolder them on the circuit board. While you have the board out, take a pencil eraser and rub it on the contact points where all the connectors slide onto the board. Spray the electrical contact cleaner to wash any residue away. Carefully reinstall the circuit board and replace the top cover. Our machine has done dozens of loads since I did this with no more problems. I expect another failure at some point when the points deteriorate on the swapped relay. At that point I will try and find replacements for both relays. The K2 relay apparently has less voltage going thru the contacts and does not fail. If you feel real comfortable, you can check the "wiping" action of the points by manually operating the relay when you have it out. I adjusted mine to give a bit more wipe on both relays. I hope this helps...it worked for me!!
Posted on Jan 10, 2009
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