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3 Troubleshooting
Service Manual
36
Table 3-3 Troubleshooting Chart - Noisy System
FAULT CAUSE CORRECTIVE ACTION
Noisy
Operation
- Supply gas problem. Natural gas
pressures should be between 4 inches
w.c. and 14 inches w.c. LP gas pressures
should be between 8 inches w.c. and 14
inches w.c.
• Refer to Section 7 - Gas Connections of the Knight
XL Installation and Operation Manual for detailed
information concerning the gas supply.
- Gas/air mixture problem. • Refer to the Gas Valve Adjustment Procedure on
page 45 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
Knight XL Installation and Operation Manual.
- Dirty/damaged burner. • Refer to page 31 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
Knight XL 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.
No Pump
Operation -
Boiler Pump
System Pump
or
DHW Pump
- Blown fuse.
• Replace fuse F1 on the control board, see page 33 of
this manual.
Note: Make sure pump amperage does not exceed
1.8 amps.
- Faulty pump.
• Replace pump.
- Internal fault on control board.
• Replace main control board.
Relief Valve
Opening
-System pressure exceeds relief valve
setting.
• Lower the system pressure below the 30 psi 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.