Fault Messages Displayed On Boiler Interface; Table 3-4 - Troubleshooting Chart - Fault Messages - Lochinvar KNIGHT 81-286 Service Manual

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Troubleshooting
Table 3-4 Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT
- Either the optional manual reset low gas
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.)
- The gas pressure switch contacts on the
Flow Switch/
LWCO
- Either the optional flow switch or the optional
low water cutoff is not making.
(will require a manual
reset once condition has
been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
- Blown fuse.
Blocked Drain SW
(will require a manual
reset once condition has
The blocked drain switch has detected
been corrected. Press
excessive condensate build up inside the
the RESET button on the
unit.
SMART SYSTEM display
to reset.)
(continued)
DESCRIPTION
pressure switch or the optional manual reset
high gas pressure switch tripped.
Low Voltage Connection Board are open.
CORRECTIVE ACTION
• 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. and LP gas pressures
should be between 8 - 14 inches w.c.
• Refer to Section 7 - Gas Connections of the Knight
Boiler 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.
• Check for a loose or misplaced jumper on the Low
Voltage Connection Board.
• Check for the addition of a device wired across the
gas pressure switch terminals on the Low Voltage
Connection Board.
• Check boiler pump operation on a call for heat.
• Check for closed valves or obstructions in the boiler
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 or
LWCO is not installed.
• Replace fuse F3 on the control board, see page 33
of this manual.
• Check condensate tube from unit to floor drain for
proper installation and obstructions.
• Inspect condensate trap for blockage.
necessary.
• Check for loose wiring connection at wire harness
plug.
• Bad blocked drain switch. Replace switch.
Service Manual
Clean if
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