Service Manual
3 Troubleshooting
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT | DESCRIPTION | CORRECTIVE ACTION | ||
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| Automatic Reset High Limit: | |
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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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| heat. If voltage is not present, check wiring back to | |
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| the pump relay. | |
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| • Replace the pump relay if necessary. | |
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| • If 120 VAC is present on a call for heat and the boiler | |
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| pump is not operating, replace the pump. | |
Automatic Reset |
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| • If the system pump is a variable speed pump, ensure | |
High Limit / HEX- |
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| that the system flow is not less than the boiler flow. | |
Temp SW | Either the | • If operating on either an inlet or system supply | ||
(will require a manual | ||||
reset once the condition | or the | sensor, check temperature setting of the main control | ||
board. | ||||
has been corrected. Press | opened. |
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| • If the high limit has tripped, check setting of the | |||
the RESET button on the |
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display to reset.) |
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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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| HEX Temp SW: | |
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| • Check continuity across two contacts. Wires should | |
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| be connected at both poles of normally closed switch. | |
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| • Inspect the rear of the inner combustion chamber | |
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| at the burner level, for refractory breakdown/missing. | |
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| Replace the refractory if no damage to the heat | |
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| exchanger as a result of the burner, otherwise, | |
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| replace the heat exchanger. | |
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| • Faulty | |
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| switch. | |
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| • Vent/air intake lengths exceed the maximum allowed | |
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| lengths. Refer to Section 2 - General Venting of the | |
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| SYNC Installation and Operation Manual for | |
Blower RPM’s | The actual fan rpm is 30% lower than what | proper lengths. | ||
• Check for obstruction or blockage in the vent/air | ||||
Too Low | is being called for. | Reference the Burners | ||
Screen information | on page 32 of this | intake pipes or at terminations. | ||
(will require a manual | • Check the wiring connections at the fan and at the | |||
manual. |
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reset once the condition |
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has been corrected. Press |
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| main control board. | |
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| • Replace the fan. | ||
the RESET button on the |
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display to reset.) |
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| • Replace the main control board. | |
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| Blown fuse. |
| • Replace fuse F4 on the control board, see page 43 of | |
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| this manual. | ||
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