SERVICE HANDBOOK

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUALFAULT MESSAGESDISPLAYED MESSAGECONDITION/INDICATES“AC Reversed”The control system has detected the power supplypolarity is reversed.CHECK/REPAIR• Check incoming power supply wiring to thewater heater in the junction box - ensure thatthe hot wire is connected to the water heater’sblack wire and the neutral wire is connected tothe water heater’s white wire inside the junctionbox. See electrical requirements on page 8.• Check for 120 VAC at CCB’s J3 Socket (page36) 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 shownon the water heater labeling for further assistanceif the problem has not been correctedafter performing the procedures outlined here.“Upper Probe Open”The control system has detected over 56,000 ohmsfrom the Temperature Probe on top of the waterheater.• Check Temperature Probe plug and socket connectionat CCB’s J7 Socket (page 36). Performclose visual inspection of the pins inside theplug and socket - ensure plugs and sockets aremating properly and providing good contact.• Check all wiring between the TemperatureProbe and the J7 Socket on the CCB. Repair/replace anything worn or damaged.• Unplug J7 plug from CCB, check resistancebetween the two black wires in the plug end withan ohm meter. If resistance is above 56,000ohms - replace the Temperature Probe.• Call the technical support phone number shownon the water heater labeling for further assistanceif the problem has not been correctedafter performing the procedures outlined here.Technical Literature Department 43 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent