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Technical Literature Department 51 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
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE
CONDITION/INDICATES
CHECK/REPAIR
“Ignition Failure”
The control system has detected less than 1.0 µA
(DC micro amps) through the flame sensor during
the Ignition Verification operating state on three
consecutive trials for ignition.
Rough Starting - Rough Operation Note:
If the water heater is experiencing rough operation
or rough starting review the Service Notes - Blower
Flange & Blower Adapter Gaskets on page 13.
Call the technical support phone number shown on
the water heater labeling for further assistance if the
problem has not been corrected after performing the
procedures outlined here.
• Check for 24 VAC to the Gas Valve solenoid coil
at the in-line male/female spade connectors
during the Ignition Activation operating state
(Gas Valve icon will be visible on the UIM dis-
play during this period).
• Check all wiring, plugs, and sockets between
the Gas valve solenoid coil and CCB’s J6
Socket pins 2 & 15 (page 35). Repair/replace
anything worn or damaged.
If 24 VAC is not being sent to the Gas Valve
solenoid coil during the Ignition Activation oper-
ating state and all wiring, plugs, and sockets are
in good condition and making good contact - call
the technical support phone number shown on
the water heater labeling for further assistance.
• Check supply and manifold gas pressures. This
procedure is illustrated and explained on pages
16 and 17.
If supply gas pressure is below the minimum
requirement shown in Table 2 on page 17 -
raise/restore supply gas pressure to minimum
requirement. If supply gas pressure is above
maximum requirement - reduce supply gas
pressure below maximum requirement.
If there is not a rise in manifold pressure and a
corresponding drop in supply gas pressure
when the Gas Valve is energized as outlined on
on pages 16 and 17 the gas valve is not open-
ing or is clogged and is not allowing gas to flow
to the burner - continue to the next procedure.
• Remove the Gas Valve and ensure the gas ori-
fice and gasket are installed properly and that
the correct size orifice for the fuel type is
installed. The procedure for removing the gas
valve to check the gas orifice is illustrated and
explained on page 15. Inspect the Gas Valve for
any signs of damage - replace if necessary.
• Remove the burner and inspect it for damage or
debris that may have collected inside the burner
and be causing the ignition failure. The burner
removal procedure is illustrated and explained
on pages 11 through 13. If the burner is dam-
aged or severely clogged with debris - replace
the burner.