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3 Troubleshooting
46
Table 3E Troubleshooting Chart - Noisy System
FAULT CAUSE CORRECTIVE ACTION
Noisy
Operation
- Supply gas problem. Natural gas pressures
should be between 4 inches w.c. (1.0 kPa)
and 14 inches w.c. (3.5 kPa). LP gas
pressures should be between 8 inches w.c.
(2.0 kPa) and 14 inches w.c. (3.2 kPa).
• Refer to Section 6 - Gas Connections of the SYNC
Installation and Operation Manual for detailed
information concerning the gas supply.
- Gas/air mixture problem.
• Refer to the Gas Valve Adjustment Procedure on
page 55 of this manual for the proper gas valve setting.
Verify that the vent/air intake lengths do not exceed the
maximum listed in the General Venting section of the
SYNC Installation and Operation Manual.
- Dirty/damaged burner.
• Refer to page 39 in this manual for the burner removal
and inspection procedure. Clean or replace the burner
as necessary.
- Low water flow through the heat exchanger.
• Refer to Section 6 - Hydronic Piping of the
SYNC Installation and Operation Manual for
minimum flow rates. Verify that the boiler is piped in a
primary/secondary fashion and that the boiler and
system pump are running on a call for heat.
- Air in the piping system. • Properly purge all air from the piping system.
- Low system water pressure.
• Verify system pressure is a minimum of 12 psi
(82.7 kPa).
No Pump
Operation -
Boiler Pump
System Pump
or
HW Pump
- Blown fuse.
• Replace fuse F5 on the control board, see page 43 of
this manual.
- Faulty pump. • Replace pump.
- Internal fault on control board. • Replace main control board.
- Faulty pump relay. • Replace relay.
Relief Valve
Opening
- System pressure exceeds relief valve
setting.
• Lower the system pressure below the 50 psi
(344.7 kPa) rating of the supplied relief valve or replace
the standard relief valve with a higher rated valve up to
the maximum pressure of the heat exchanger.
• Improperly sized expansion tank.
Gas Pressure
Switch
(will require a
manual reset once
the condition has
been corrected.
Press the RESET
button on the
display to reset.)
Either the manual reset low gas pressure
switch or the manual reset high gas pressure
switch tripped.
• Reset the pressure switches.
• Measure the supply gas pressure to determine cause
of failure. Natural gas pressures should be between
4 - 14 inches w.c. (1.0 - 3.5 kPa) and LP gas
pressures should be between 8 - 14 inches w.c.
(2.0 - 3.2 kPa).
• Refer to Section 6 - Gas Connections of the SYNC
Installation and Operation Manual for detailed
information concerning the gas supply.
• Correct the supply gas pressure if necessary.
• Check for a loose or misplaced jumper if pressure
switches are not installed.
Service Manual