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Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Air Flow Too
Low
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
Air pressure switch contacts are open.
• Check the wiring connections to switch. Wires should
be connected to the common and normally closed
terminals.
• Vent/air intake lengths exceed the maximum allowed
lengths. Refer to Section 2 - General Venting of the
SYNC Installation and Operation Manual for
proper lengths.
• Check for obstruction or blockage in the vent/air
intake pipes or at terminations.
• Check reference hoses connected to the air pressure
switch for blockage or obstruction.
• Inspect the burner. Reference page 39 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Inspect the heat exchanger. Reference page 40 of
this manual for removal and cleaning procedures.
Replace if necessary.
• Faulty air pressure switch. Replace switch.
Flap valve contacts are in an open position.
• Check the wiring connections to the flap valve switch.
Replace or repair wiring if necessary.
• Check for obstruction in the vent / air intake pipes or
at terminations.
• Verify combustion air blower is operating. Replace if
necessary.
• Replace flap valve switch.
Flap Valve
Stuck Open
Flap valve contacts are in a closed position.
• Check wiring connections to the flap valve switch.
Replace or repair wiring if necessary.
• Check flap valve for obstruction or blockage.
• Replace flap valve switch.
Too Many
Resets - Try Later
Too many manual resets have occurred
during a 15 minute period.
• Wait 15 minutes and try again.
• Turn power off to unit, wait 30 seconds and then turn
power back on.
Voltage Too
Low
120 VAC input to the main control board has
dropped below 80 VAC.
• Check 120 VAC supply to the transformer.
• Check wiring connections at the low voltage terminal
strip.
• Check the wire size/length to remote devices.
• Replace the main control board.
52
3 Troubleshooting
Service Manual