1) Check that the wire connections are secure and free of burns or cuts. The mixing
thermistor is embedded in the water outlet connection.
2) Check the resistance value; it should be about 9.0k? at room temperature (about 74°F).
3) Clean the thermistor.
a. Drain the unit of water. See p. 21.
b. Remove the computer board to access the mixing thermistor. The computer is fixed in place by a single screw at the top of the board.
c. Remove the screw, pull out the sensor probe. Clean the probe to a silver finish. Do not lose the red rubber o?ring that wraps around this sensor.
d. Replace and test.
4) If the error code persists, replace the thermistor.