SERVICE HANDBOOK

CCBULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUALThe CCB circuit board is the main control. All instructions for ignition and temperaturecontrol originate from this circuit board. Diagnostic and operational messages are generatedby the CCB and sent to the UIM (page 27). Most of the water heater’s components, such asthe igniter, blower, gas valve, and temperature probe are directly connected to one of theCCB’s socket connectors.Service Notes - CCB ReplacementIf the CCB fails and needs to be replaced the replacement board will be shipped with thegray plastic enclosure and a new 24 VAC transformer. There is no need to remove the circuitboard from the enclosure when the CCB is being replaced.CCB Circuit BoardEnclosure With Front RemovedTransformer120V x 24V50 VATechnical Literature Department 35 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent