ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
FAULT MESSAGES (CONT)
| DISPLAYED MESSAGE |
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| CHECK/REPAIR |
| CONDITION/INDICATES |
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| “Ignition Failure” |
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| • Check for 24 VAC to the Gas Valve solenoid coil |
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| at the |
| The control system has detected less than 1.0 µA |
| during the Ignition Activation operating state | |
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| (Gas Valve icon will be visible on the UIM dis- | ||
| (DC micro amps) through the flame sensor during |
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| play during this period). | ||
| the Ignition Verification operating state on three |
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| consecutive trials for ignition. |
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| • Check all wiring, plugs, and sockets between |
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| the Gas valve solenoid coil and CCB’s J6 |
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| Socket pins 2 & 15 (page 35). Repair/replace |
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| anything worn or damaged. |
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| If 24 VAC is not being sent to the Gas Valve |
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| solenoid coil during the Ignition Activation oper- |
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| ating state and all wiring, plugs, and sockets are |
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| in good condition and making good contact - call |
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| the technical support phone number shown on |
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| the water heater labeling for further assistance. |
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| • Check supply and manifold gas pressures. This |
| Rough Starting - Rough Operation Note: |
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| procedure is illustrated and explained on pages |
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| 16 and 17. | |
| If the water heater is experiencing rough operation |
| If supply gas pressure is below the minimum | |
| or rough starting review the Service Notes - Blower |
| requirement shown in Table 2 on page 17 - | |
| Flange & Blower Adapter Gaskets on page 13. |
| raise/restore supply gas pressure to minimum | |
| Call the technical support phone number shown on |
| requirement. If supply gas pressure is above | |
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| maximum requirement - reduce supply gas | ||
| the water heater labeling for further assistance if the |
| pressure below maximum requirement. | |
| problem has not been corrected after performing the |
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| procedures outlined here. |
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| If there is not a rise in manifold pressure and a |
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| corresponding drop in supply gas pressure |
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| when the Gas Valve is energized as outlined on |
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| on pages 16 and 17 the gas valve is not open- |
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| ing or is clogged and is not allowing gas to flow |
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| to the burner - continue to the next procedure. |
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| • Remove the Gas Valve and ensure the gas ori- |
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| fice and gasket are installed properly and that |
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| the correct size orifice for the fuel type is |
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| installed. The procedure for removing the gas |
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| valve to check the gas orifice is illustrated and |
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| explained on page 15. Inspect the Gas Valve for |
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| any signs of damage - replace if necessary. |
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| • Remove the burner and inspect it for damage or |
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| debris that may have collected inside the burner |
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| and be causing the ignition failure. The burner |
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| removal procedure is illustrated and explained |
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| on pages 11 through 13. If the burner is dam- |
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| aged or severely clogged with debris - replace |
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| the burner. |
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Technical Literature Department | 51 of 52 | Ashland City, TN © 2008 | ||
Servicing should only be performed by a Qualified Service Agent