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To check the wiring harness, set your multimeter to check continuity, and then simply connect the probes - one to each end of the wire (one at then sensor and the other at the CCM.) I don't remember if they're color coded, but it's a short enough run from top to bottom that you should be able to figure out each pair and where it goes. You want to make sure there's not a break inside the Wire. If you do, simple run a replacement wire for whichever one is broken....no need to order and replace the entire harness. Let me know if that doesn't make sense.
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Originally Posted by: bubver  Having same problem, f05 code after 2-3 minutes and only hot water regardless of setting. Can you tell me how to perform resistance checks on wire harness at ccu, heater element and heat relay? I have tested water temp sensor and it tests fine... but I am a novice and do not know how to check the other things. Thanks Bubver, We know the thermistor checks OK, so the next move is to remove the TH2 connector from the CCU, and check for 9 to 10 ohms resistance across the two wires in the connector. If you have the resistance, then the thermistor and wire harness are intact and operable, the issue would be in the CCU. If your washer is equipped with a heater element, there should be a resistance(closed circ.) reading across the two heater terminals, if there is no resistance (open circ.) then the heater has failed and needs to be replaced. You can disconnect the HE2 connector from the CCU, and check across pin 1 and pin 2 in the harness and check for a "closed" circuit, this will check the heater and the wire harness. If the resistances at the CCU are incorrect, then you'll need to start checking the wiring harness using Twarnock's methods.
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