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| Service Manual |
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3 Troubleshooting (continued) |
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Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface |
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FAULT | DESCRIPTION |
| CORRECTIVE ACTION |
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| • If 24 VAC is present at the main control board, check |
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| the wiring between the main control board and the gas |
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| valve. Replace the wiring if necessary. Do not |
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| disconnect the wiring from the gas valve and attempt |
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| to measure voltage at that point. The main control |
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| board can detect if the gas valve is not connected and |
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Flame Lost |
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| will display the Gas Valve / Connection fault. |
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| • If 24 VAC is present, check the outlet of the valve to |
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While Running |
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| ensure the valve is flowing gas. With a manometer |
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(cont’d) | The unit was running and lost the flame |
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connected to the outlet tap of the gas valve, when the |
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(will require a |
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signal. This condition occurred twice . | unit is in | the prepurge | period, there | should be | a |
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manual reset once the |
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| negative | pressure present. | When | the | valve | is |
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condition has been |
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| energized a change in pressure should occur. If the |
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corrected. Press the |
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| pressure change does not occur, the gas valve is not |
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RESET button on the |
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| opening. Replace the gas valve. |
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display to reset.) |
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| • Inspect flame sensor and associated wiring. |
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| Reference page 39 of this manual for removal and |
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| cleaning procedures. Replace if necessary. |
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| • Inspect the burner. Reference page 39 of this manual |
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| for removal and cleaning procedures. Replace if |
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| necessary. |
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| • Replace the main control board. |
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| • Verify that the system is full of water and that all air |
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| has been properly purged from the system. |
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| • Verify that the boiler is piped properly into the heating |
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| system. Refer to Section 6 - Hydronic Piping of the |
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| SYNC | Installation | and | Operation | Manual |
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| for the proper piping methods for the SYNC. |
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| • Check voltage to boiler pump motor on a call for |
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Manual Reset |
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| heat. If voltage is not present, check wiring back to |
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| the pump relay. |
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High Limit |
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| • Replace the pump relay if necessary. |
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(will require a |
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| • If 120 VAC is present on a call for heat and the boiler |
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manual reset once the | The outlet water temperature has exceeded |
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condition has been | the setting of the high limit. | pump is not operating, replace the pump. |
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corrected. Press the | • If the system pump is a variable speed pump, ensure |
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RESET button on the |
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| that the system flow is not less than the boiler flow. |
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display to reset.) |
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| • If operating on either an inlet or system supply |
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| sensor, check temperature setting of the main control |
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| board. |
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| • If the high limit has tripped, check setting of the |
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| device. |
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| • Check resistance of water sensors and compare to |
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| Table 3B on page 45 of this manual. Replace sensor |
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| if necessary. |
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| • Replace high limit. |
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