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Servicing should only be performed by a Qualified Service Agent
31
OPERATION & SERVICE
Contactor Inspection
A thorough visual inspection of the contactors used on Electronic Control Models should be
performed as part of any regular maintenance program and whenever the water heater is
being serviced. Refer to the listed Steps and images below for this procedure.
1 Secure power to the water heater at the main breaker or disconnect switch.
2 Verify with an AC volt meter that there is not any voltage present at the Power Distribution Block, power
circuit fuse block and all wiring terminals on the contactors. See Figure 2 on page 9 for the location of
these components.
3 Remove the top cover (two small screws) from the contactor.
4 Check for and remove any debris from the area surrounding the switch contacts. IE: ants will occasionally
infest the switch contacts and eventually cause the contactor to malfunction.
5 Physically test the mechanical spring action of the contactor by depressing the contactor mechanism. If the
action is not smooth and/or sticks - replace the contactor.
6 Perform a close visual inspection of the switch contacts. The contacts are silver plated and should be
smooth. Contactor chatter (see pages 6 & 34), voltage spikes, arcing, excessive current along with normal
wear and tear can cause the normally smooth surface of the contacts to become burnt, pitted and
damaged. In extreme cases the contacts can “weld” closed. The switch contacts are not replaceable. If the
contacts show signs of excessive wear - replace the contactor.
7 Replace the top cover on all contactors when inspection is complete.
Top View Cover Plate On Side View Cover Plate Removed Physically Operate Mechanical
Perform Close Visual Inspection
Of Switch Contacts
Spring Action Of Contactor
Press Down Here