Lochinvar Shield SNR150-100 - Manual (Page 65)

65
13
Troubleshooting
(continued)
Table 13D 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 for detailed
information concerning the gas supply.
- Gas/air mixture problem.
• Refer to the Gas Valve Adjustment Procedure on
page 73 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.
- Dirty/damaged burner.
• Refer to page 60 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 - System Piping for minimum flow
rates.
- Air in the piping system. • Properly purge all air from the piping system.
No Pump
Operation
- Blown fuse.
• Replace fuse F5 on the control board, see page 62 of
this
manual.
- Faulty pump. • Replace pump.
- Faulty pump relay. • Replace pump relay.
- Internal fault on control board. • Replace main control board.
Relief Valve
Opening
- System pressure exceeds relief valve
setting.
• Lower the system pressure below the 150 PSI rating of
the supplied relief valve.
Installation & Service Manual TM