ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES (CONT)
DISPLAYED MESSAGE | CHECK/REPAIR | |
CONDITION/INDICATES | ||
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“Ignition Failure” | • Visually check for burner flame through the view | |
| port on the top of the water heater (see illustra- | |
The control system has detected less than 1.0 µA | tions on page 11) during the Ignition Verification | |
operating state (Table 5 - page 31) - the Gas | ||
(DC micro amps) through the flame sensor during | ||
Valve icon will appear on UIM display during this | ||
the Ignition Verification operating state on three | ||
operating state. | ||
consecutive trials for ignition. | ||
• Ensure the gas supply shut off valve is open. | ||
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| • Ensure there is adequate air for combustion & | |
| ventilation. See air requirements in the Instruc- | |
| tion Manual that came with the water heater. | |
| • Ensure the burner is grounded - see electrical | |
| requirements and service notes on page 8. | |
| • Ensure flame sensor wiring is plugged in | |
| securely at the CCB’s J4 male spade connector | |
| (page 35) and at the flame sensor wiring termi- | |
| nal (page 24). | |
Rough Starting - Rough Operation Note: | • Check all wiring between the flame sensor and | |
the CCB J4 connection. Repair/replace anything | ||
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If the water heater is experiencing rough operation | worn or damaged as necessary. | |
• Remove and clean the flame sensor (page 24) | ||
or rough starting review the Service Notes - Blower | ||
Flange & Blower Adapter Gaskets on page 13. | with fine steel wool - check for signs of exces- | |
| sive wear, bent, damage, cracks in the insulator | |
Call the technical support phone number shown on | - replace flame sensor if worn or damaged. | |
the water heater labeling for further assistance if the | • Check for flame sensing current during the Igni- | |
problem has not been corrected after performing the | tion Verification operating state - Gas Valve icon | |
procedures outlined here. | will appear on UIM display (Table 5 - page 31). | |
| Flame sensing current test procedure is illus- | |
| trated and explained on page 24. | |
| If flame sensing current measured is well above | |
| the 1.0 µA (DC micro amps) minimum during | |
| this test and the control system continues to | |
| declare the Ignition Failure fault condition after | |
| three trials - call the technical support phone | |
| number shown on the water heater labeling for | |
| further assistance. | |
| If the flame sensing current measured is not | |
| established or is below 1.0 µA - continue to the | |
| next check/repair procedure. | |
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Technical Literature Department | 50 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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