OPERATION & SERVICE
Servicing should only be performed by a Qualified Service Agent
38
Contactor Coil Voltage Test - At CCB
This test procedure will measure contactor coil voltage where it originates at the J4 & J17
wiring terminals on the CCB. See page 50 for the CCB’s J4 wiring terminal location.
1 Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary.
2 Adjust the temperature settings to ensure a call for heat is active for all heating elements. Raise the
Operating Set Point to 140°F or higher. Set all Differentials at 2°F - see pages 61 and 62.
3 Using an AC volt meter; set the volt meter to an AC voltage range just above 120 VAC.
4 Touch one of the two volt meter probes to the ground wire connection on the water heater. Touch the other
volt meter probe to the CCB’s J4 OUT 1 wiring terminal. See the images below. On water heaters
equipped with more heating elements also check between the ground connection and the CCB: J4 OUT 2,
J4 OUT 3, J17 OUT 4 and J17 OUT 5 wiring terminals to ensure the CCB is sending 120 VAC to the other
contactor coils. Measure and record voltage output for all contactors at the CCB - up to 5 voltage readings
on models so equipped.
Service Warning: Be extremely careful when performing this test procedure - there will be high voltage
present at many terminals and wiring connections in the surrounding area.
5 If the measured voltage(s) were approximately 120 volts the CCB is operating properly.
6 If the measured voltage(s) were zero or considerably less than 120 volts call the toll free Technical Support
phone number listed on the back cover of this manual for further assistance.
Checking Contactor Coil Voltage at the CCB’s J4 & J17 Wiring Terminals
Water Heater Ground ConnectionCCB’s J4 OUT 1 TerminalCCB J4 & J17 Wiring Terminals
J4
J17
J4
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