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Technical Literature Department 43 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
DISPLAYED MESSAGE
CONDITION/INDICATES
CHECK/REPAIR
“AC Reversed”
The control system has detected the power supply
polarity is reversed.
• Check incoming power supply wiring to the
water heater in the junction box - ensure that
the hot wire is connected to the water heater’s
black wire and the neutral wire is connected to
the water heater’s white wire inside the junction
box. See electrical requirements on page 8.
• Check for 120 VAC at CCB’s J3 Socket (page
36) pins 1 & 3 with J3 plug inserted, power on.
Check for AC voltage between pin 1 and ground
- should indicate 120 VAC.
Check for AC voltage between pin 3 and ground
- should indicate 0 VAC.
• Call the technical support phone number shown
on the water heater labeling for further assis-
tance if the problem has not been corrected
after performing the procedures outlined here.
“Upper Probe Open”
The control system has detected over 56,000 ohms
from the Temperature Probe on top of the water
heater.
• Check Temperature Probe plug and socket con-
nection at CCB’s J7 Socket (page 36). Perform
close visual inspection of the pins inside the
plug and socket - ensure plugs and sockets are
mating properly and providing good contact.
• Check all wiring between the Temperature
Probe and the J7 Socket on the CCB. Repair/
replace anything worn or damaged.
• Unplug J7 plug from CCB, check resistance
between the two black wires in the plug end with
an ohm meter. If resistance is above 56,000
ohms - replace the Temperature Probe.
• Call the technical support phone number shown
on the water heater labeling for further assis-
tance if the problem has not been corrected
after performing the procedures outlined here.