ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE | CHECK/REPAIR | |
CONDITION/INDICATES | ||
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“Blocked Exhaust Vent” | • Check for restrictions, too many equivalent feet, | |
| or too many elbows in the vent pipe. Ensure | |
The control system has detected open contacts at | • Review venting installation section of the | |
the Blocked Exhaust air pressure switch - the water | Instruction Manual that came with the water | |
heater is not venting properly. | heater - see Table 1 on page 7 in this manual. | |
| Ensure the vent/intake air piping has been | |
| installed within manufacturers requirements. | |
| • Check all wiring between the Blocked Exhaust | |
| air pressure switch and the CCB’s J6 Socket | |
| (page 36) pins 5 & 10. Perform close visual | |
| inspection of the pins inside the plug and socket | |
| - ensure plugs and sockets are mating properly | |
| and providing good contact. Repair/replace any- | |
| thing worn or damaged. | |
| • Review the air pressure switch information | |
| beginning on page 18. Perform the pressure | |
| switch test procedure for the Blocked Exhaust | |
| air pressure switch - see pages 21 through 23. | |
| Replace the Blocked Exhaust switch if defec- | |
| tive. | |
| • 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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“Blower Prover Failure” | • Check all wiring between the Blower Prover air | |
| pressure switch and the CCB’s J6 Socket (page | |
The control system has detected closed contacts at | 36) pins 6 & 7. Ensure there are no shorted or | |
pinched wires. | ||
the Blower Prover air pressure switch out of | ||
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sequence. Blower Prover air pressure switch | • Ensure there are no jumper wires installed on | |
contacts should be open at the beginning of each | the Blower Prover switch. | |
heating cycle - see the Sequence of Operation on | • Ensure there are no jumper wires installed | |
page 40. | ||
between the CCB’s J6 Socket pins 6 & 7. | ||
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| • Review the air pressure switch information | |
| beginning on page 18. Perform the pressure | |
| switch test procedure for the Blower Prover air | |
| pressure switch - see pages 21 through 23. | |
| Replace the Blower Prover switch if defective. | |
| • 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 | 47 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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