This code is common. What gets me is the pot (same one in a toyota car) has a switch and pot. 2 wires for "on" switch are supposed to be 3 ohms new..but often the best you get is 20 ohms. When code appears, the resistance of the "on" swith is 75 or more ohms. Also, the wiper resistance does not sweep smoothly when bad...it jumps with the fluke meter needle. Some switches are bad right off the bat! Using 100 psi to blow the machine does not help them. Plugs are a problem too...female pins spead their legs...and that could be trouble...;)