Lochinvar Armor 150 - 500 - Manual (Page 24)

3
Troubleshooting
24
Service Manual
Table 3D 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 Armor
Water Heater Installation and Operation Manual for
detailed information concerning the gas supply.
- Gas/air mixture problem.
• Refer to the Gas Valve Adjustment Procedure on
page 33 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
Armor Water Heater Installation and Operation Manual.
- Dirty/damaged burner.
• Refer to page 19 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 of the Armor Water
Heater Installation and Operation Manual for minimum
flow rates.
- 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
- Blown fuse.
• Replace fuse F5 on the control board, see page 21 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.
APS
Open
(will require a
manual reset once the
condition has been
corrected. Press the
RESET button on the
SMART SYSTEM
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.
• Air intake lengths exceed the maximum allowed
lengths. Refer to Section 3 - General Venting of the
Armor Water Heater Installation and Operation Manual
for proper lengths.
• Check for obstruction or blockage in the air
intake pipes or at terminations.
• Check reference hoses connected to the air pressure
switch for blockage or obstruction.
• Inspect the burner. Reference page 19 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Inspect the heat exchanger. Reference page 20 of this
manual for removal and cleaning procedures. Replace
if necessary.
• Faulty air pressure switch. Replace switch.