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OPERATION & SERVICE
Servicing should only be performed by a Qualified Service Agent
38
Temperature Sensor Resistance Test
1 Secure power to the water heater at the main breaker or disconnect switch.
2 Unplug the J5 plug from the CCB circuit board - see page 42 for location.
3 Using an ohm meter: set the ohm meter range to a scale above 30,000 ohms initially.
4 Touch the ohm meter probes between the two middle pins (black wires) of the J5 plug end as shown in the
image below. Compare the measured resistance value (ohms) to the values given in the resistance data
table below. Temperature probes are very reliable and should only be replaced when:
• The resistance test indicates an “open” (infinite resistance) or a “direct short” (no resistance) circuit.
• The nature of the service problem is temperature control and the resistance readings are
considerably (25% or more) different than the values in the table here at the given temperature.
Temperature Sensor Resistance Data
WATER TEMPERATURE
RESISTANCE
IN OHMS
Celsius Fahrenheit
3° 40° 26,435
21° 70° 11,974
38° 100° 5,862
49° 120° 3,780
55° 130° 3,066
60° 140° 2,503
71° 160° 1,698
82° 180° 1,177
Checking Temperature Sensor Resistance