Lochinvar Knight 151, Руководство по обслуживанию

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3
Troubleshooting
Table 3F Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Gas Pressure SW
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM
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.
• Refer to Section 4 - Gas Connections of the Armor Outdoor
Water Heater 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.
Flow Switch
(will require a manual
reset once condition has
been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
The flow switch is not making.
• Check water heater pump operation on a call for heat.
• Check for closed valves or obstructions in the water heater
piping.
• Verify system is full of water and all air has been purged
from the system.
• Check for loose or misplaced jumpers if flow switch is not
installed.
Blown fuse.
• Replace fuse F2 on the control board, see page 24 of
this manual.
Blocked Drain SW
(will require a manual
reset once condition has
been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
The blocked drain switch has
detected excessive condensate build
up inside the unit.
• Check condensate tube from unit to floor drain for proper
installation and obstructions.
• Inspect condensate trap for blockage. Clean if necessary.
• Check for loose wiring connection at wire harness plug.
• Bad blocked drain switch. Replace switch.
APS / HEX
Temp Sw
Open
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM
display
to reset.)
Either the air pressure switch contacts
are open, the O-temp heat exchanger
switch has opened, or the burner
door temperature switch has opened.
APS:
• 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.
• 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 22 of this manual
for removal and cleaning procedures. Replace if necessary.
• Inspect the heat exchanger. Reference page 23 of
this manual for removal and cleaning procedures.
Replace if necessary.
• Faulty air pressure switch. Replace switch.
O-TEMP HEX SWITCH
(Applies to the 286 - 801 Models Only):
• Inspect the back of the inner combustion chamber at burner
level for refractory breakdown / missing. Replace heat
exchanger if refractory is broken and unit has fired.
• Check continuity across two contacts. Wires should be
connected at both poles of the normally closed switch.
• Faulty O-Temp HEX Switch. Replace switch.
BURNER DOOR TEMPERATURE SWITCH
(Applies to the 286 - 801 Models Only):
• The underlying cause of the fault must be identified and
resolved by a qualified service technician before
resetting the burner door temperature switch.
• Check continuity across two contacts. Wires should be
connected at both poles of the normally closed switch.
• Faulty burner door temperature switch. Replace burner door
temperature switch.
28
Outdoor Armor Water Heater Service Manual
If the burner door
temperature

WARNING
switch trips, the burner door and the
burner door temperature switch will
be extremely HOT. Allow the unit
to cool before touching. Failure to
follow this warning could result in
severe personal injury, death, or
substantial property damage.