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Technical Literature Department 35 of 52 Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent
ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
CCB
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 (page 27). Most of the water heater’s components, such as
the igniter, blower, gas valve, and temperature probe are directly connected to one of the
CCB’s socket connectors.
Service Notes - CCB Replacement
If the CCB fails and needs to be replaced the replacement board will be shipped with the
gray plastic enclosure and a new 24 VAC transformer. There is no need to remove the circuit
board from the enclosure when the CCB is being replaced.
Transformer
CCB Circuit Board
Enclosure With Front Removed
120V x 24V
50 VA