Troubleshooting Chart - Noisy System - Lochinvar Shield SNR150-100 Installation & Service Manual

12
Troubleshooting
Table 12D Troubleshooting Chart - Noisy System
FAULT
- 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.
- Gas/air mixture problem.
Noisy
Operation
- Dirty/damaged burner.
- Low water flow through the heat exchanger.
- Air in the piping system.
- Blown fuse.
No Pump
- Faulty pump.
Operation
- Faulty pump relay.
- Internal fault on control board.
Relief Valve
- System pressure exceeds relief valve
Opening
setting.
(continued)
CAUSE
Installation & Service Manual
TM
CORRECTIVE ACTION
• Refer to Section 6 - Gas Connections for detailed
information concerning the gas supply.
• 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.
• Refer to page 60 in this manual for the burner removal
and inspection procedure. Clean or replace the burner
as necessary.
• Refer to Section 5 - System Piping for minimum flow
rates.
• Properly purge all air from the piping system.
• Replace fuse F5 on the control board, see page 62 of
this manual.
• Replace pump.
• Replace pump relay.
• Replace main control board.
• Lower the system pressure below the 150 PSI rating of
the supplied relief valve.
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