Service Manual
3 Troubleshooting
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT | DESCRIPTION | CORRECTIVE ACTION | |
| Air pressure switch contacts are open. | • Check the wiring connections to switch. Wires should | |
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| be connected to the common and normally closed | |
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| terminals. | |
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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 | |
|
| SYNC Installation and Operation Manual for | |
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| proper lengths. | |
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| • Check for obstruction or blockage in the vent/air | |
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| intake pipes or at terminations. | |
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| • Check reference hoses connected to the air pressure | |
Air Flow Too |
| switch for blockage or obstruction. | |
Low |
| • Inspect the burner. Reference page 39 of this manual | |
(will require a manual |
| for removal and cleaning procedures. Replace if | |
reset once the condition |
| necessary. | |
has been corrected. |
| • Inspect the heat exchanger. Reference page 40 of | |
Press the RESET button |
| ||
on the display to reset.) |
| this manual for removal and cleaning procedures. | |
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| Replace if necessary. | |
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| • Faulty air pressure switch. Replace switch. | |
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| |
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| • Check the wiring connections to the flap valve switch. | |
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| Replace or repair wiring if necessary. | |
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| • Check for obstruction in the vent / air intake pipes or | |
| Flap valve contacts are in an open position. | at terminations. | |
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| ||
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| • Verify combustion air blower is operating. Replace if | |
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| necessary. | |
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| • Replace flap valve switch. | |
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| |
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| • Check wiring connections to the flap valve switch. | |
Flap Valve |
| Replace or repair wiring if necessary. | |
Flap valve contacts are in a closed position. |
| ||
Stuck Open | • Check flap valve for obstruction or blockage. | ||
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| • Replace flap valve switch. | |
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| |
Too Many | Too many manual resets have occurred | • Wait 15 minutes and try again. | |
• Turn power off to unit, wait 30 seconds and then turn | |||
Resets - Try Later | during a 15 minute period. | ||
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| power back on. | |
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| |
|
| • Check 120 VAC supply to the transformer. | |
Voltage Too |
| • Check wiring connections at the low voltage terminal | |
120 VAC input to the main control board has | strip. | ||
Low |
| ||
dropped below 80 VAC. | • Check the wire size/length to remote devices. | ||
| |||
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| ||
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| • Replace the main control board. | |
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