ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE | CHECK/REPAIR | |
CONDITION/INDICATES | ||
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“Upper Probe Short” | • Check all wiring between the Temperature | |
| Probe and the J7 Socket on the CCB (page 36). | |
The control system has detected less than 390 | Repair/replace anything worn or damaged. | |
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ohms from the Temperature Probe on top of the | • Unplug J7 plug from CCB, check resistance | |
water heater. | between the two black wires in the plug end with | |
| an ohm meter. If resistance is at or below 390 | |
| 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. |
“Flame Probe Short” | • Disconnect the wire from the flame sensor (see | |
| pages 12 and 24). Check for continuity between | |
The control system has detected that the flame | flame sensor and ground with an ohm meter. | |
There should be no continuity - infinite resis- | ||
sensor is grounded. | ||
tance. | ||
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| • If above test indicates there is continuity | |
| between the flame sensor and ground - remove | |
| the flame sensor (see pages 12 and 24). Ensure | |
| the flame sensor is not bent and touching the | |
| burner. | |
| • Check all flame sensor wiring between the | |
| flame sensor and the J4 male spade connector | |
| on the CCB (page 36). Ensure there are not any | |
| pinched wires or shorts - repair/replace anything | |
| worn or damaged. | |
| • Replace the flame sensor. | |
| • 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. |
Technical Literature Department | 44 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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