ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE | CHECK/REPAIR | |
CONDITION/INDICATES | ||
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“Blocked Inlet” | • If the water heater has been installed as a con- | |
| ventional vent appliance - Ensure the intake air | |
The control system has detected open contacts at | connection screen is not clogged with debris. | |
See Service Notes - Venting on page 7. | ||
the Blocked Intake air pressure switch - inadequate | ||
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supply of intake (combustion) air. | • If water heater has been installed as a direct | |
| vent appliance - check for restrictions, too many | |
| equivalent feet, or too many elbows in the intake | |
| air piping. Review venting installation section of | |
| the Instruction Manual that came with the water | |
| heater - see Table 1 on page 7 in this manual. | |
| Ensure the vent/intake air piping has been | |
| installed within manufacturers requirements. | |
| • If water heater has been installed as a direct | |
| vent appliance - temporarily disconnect the | |
| intake air pipe at the blower connection on the | |
| water heater - ensure the screen inside the | |
| intake air connection was removed during | |
| installation. See the Service Notes for venting | |
| on page 7. | |
| • Check all wiring between the Blocked Intake air | |
| pressure switch and the CCB’s J6 Socket (page | |
| 36) pins 4 & 14. Perform close visual inspection | |
| of the pins inside the plug and socket - ensure | |
| plugs and sockets are mating properly and pro- | |
| viding good contact. Repair/replace anything | |
| worn or damaged. | |
| • Review the air pressure switch information | |
| beginning on page 18. Perform the pressure | |
| switch test procedure for the Blocked Intake air | |
| pressure switch - see pages 21 through 23. | |
| Replace the Blocked Intake 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 | 46 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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