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CCB (CENTRAL CONTROL BOARD)
The CCB is a printed circuit board mounted inside a protective plastic enclosure, see Figures below and on
next page. The CCB circuit board is the main control. All instructions for ignition and temperature control
originate from this circuit board. Diagnostic and operational messages are generated by the CCB and sent
to the UIM, see "(UIM) User Interface Module Screen" on Page 51.
Most of the water heater's components, such as the Spark Igniter, Combustion Blower, 24 Volt Gas Control
Valve, and Temperature Probe are directly connected to one of the CCB's socket connectors.
Power Supply Board
CCB Circuit Board
120 VAC X 24 VAC, 50 VA Transformer
Power Supply Board
CCB Circuit Board
Molded Clips
Power Transformer
Temperature Probe Connectors
Front Cover On
Front Cover Removed
Servicing should only be performed by a Qualified Service Technician
45
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