ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES
DISPLAYED MESSAGE | CHECK/REPAIR | |
CONDITION/INDICATES | ||
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“AC Reversed” | • Check incoming power supply wiring to the | |
| water heater in the junction box - ensure that | |
The control system has detected the power supply | the hot wire is connected to the water heater’s | |
black wire and the neutral wire is connected to | ||
polarity is reversed. | ||
the water heater’s white wire inside the junction | ||
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| 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. | |
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“Upper Probe Open” | • Check Temperature Probe plug and socket con- | |
| nection at CCB’s J7 Socket (page 36). Perform | |
The control system has detected over 56,000 ohms | close visual inspection of the pins inside the | |
plug and socket - ensure plugs and sockets are | ||
from the Temperature Probe on top of the water | ||
mating properly and providing good contact. | ||
heater. | ||
• Check all wiring between the Temperature | ||
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| 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. | |
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Technical Literature Department | 43 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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