American Water Heater STCE3-52/80/119 Checking Power and Ground To The CCB, Checking for 120 VAC

ELECTRONIC CONTROLS

Checking Power and Ground To The CCB

The CCB circuit board is powered by the120 VAC Control Circuit Transformer (see pages 34-35)at the J2 Socket, pins 1 & 3 (see page 42). This procedure is performed to ensure the 120 VAC power is being supplied to the CCB.

1Ensure the main breaker or disconnect switch is turned on.

2Verify with an AC volt meter that proper voltage is present at the Power Distribution Block (see Figure 2 on page 9 and pages 12-14).

3Using an AC volt meter; set the volt meter to an AC voltage range just above 120 VAC.

4Ensure 120 VAC power is supplied to the CCB. With the J2 plug installed in the J2 socket on the CCB (page 42) insert the two volt meter probes into pins 1 & 3 of J2 plug as shown in the “Checking for 120 VAC” image below. Volt meter probes may have to be pressed firmly into plug to make contact with the metal conductors inside. Voltage should be approximately 120 VAC.

5If the measured voltage is approximately 120 VAC the CCB circuit board is receiving the correct power.

6If the measured voltage is zero volts or considerably less than 120 VAC:

•Check the 120 VAC wiring between the CCB J2 socket and the 120 VAC Control Circuit Transformer - ensure wiring is correct and connections are tight and making good contact.

•Check the J2 plug/socket connections on the CCB for wear or damage. Ensure they are mating properly and providing good contact - see page 42.

•Check the 120 VAC Control Circuit Transformer to ensure it is wired correctly and outputting the correct voltage - see pages 34-35.

•Check the Control Circuit fuses - see Figure 2 on page 9 for location and the Fuse test procedure on page 17.

7Ensure earth ground is supplied to the CCB. With the J2 plug installed in the J2 socket on the CCB (page 42) insert the two volt meter probes into pins 1 & 2 of the J2 plug as shown in the “Checking for Ground” image below. Volt meter probes may have to be pressed firmly into plug to make contact with the metal conductors inside. If the measured voltage is approximately 120 VAC the CCB is properly grounded.

8If the measured voltage is zero volts or considerably less than 120 VAC:

•Check the ground wiring between the CCB J2 socket and the water heater’s ground connection - ensure wiring is correct and connections are tight and making good contact.

•Ensure the water heater is properly grounded.

Checking for 120 VAC Checking for Ground

Servicing should only be performed by a Qualified Service Agent

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