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3
Troubleshooting
Table 3G Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT
Gas Pressure SW
Open
(will require a manual
Either the low gas pressure switch or the high
reset once the condition
gas pressure switches tripped.
has been corrected. Press
the RESET button on the
SMART TOUCH display
to reset.)
Low Water
Cutoff Open
The low water cutoff is not making.
(will require a manual
reset once condition has
been corrected. Press
the RESET button on the
SMART TOUCH display
to reset.)
Blown fuse.
Blocked Drain SW
Open
(will require a manual
The blocked drain switch has detected
reset once condition has
excessive condensate build up inside the
been corrected. Press
unit.
the RESET button on the
SMART TOUCH display
to reset.)
APS
Open
(will require a manual
Blocked flue/inlet pressure switch contacts
reset once the condition
are open.
has been corrected. Press
the RESET button on the
SMART TOUCH display
to reset.)
(continued)
DESCRIPTION
CORRECTIVE ACTION
• Measure the supply gas pressure to determine cause
of failure. Natural gas pressures should be between
4 inches w.c. (1.0 kPa) and 14 inches w.c. and LP gas
pressures should be between 8 inches w.c. (1.99 kPa)
and 14 inches w.c. (3.5 kPa).
• Refer to Section 6 - Gas Connections of the
Crest Installation and Operation Manual for detailed
information concerning the gas supply.
• Correct the supply gas pressure if necessary.
• Reset the LWCO from the RESET button on the front
control panel.
• 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 F2 on the control board.
• 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.
• Check the wiring connections to switch. Wires should
be connected to the common and normally closed
terminals.
• Vent/air intake lengths exceed the maximum allowed
lengths. Refer to Section 2 - General Venting of the
Crest
Installation
and
proper lengths.
• Check for obstruction or blockage in the vent/air
intake pipes or at terminations.
• Check reference hose and tubing connected to the
pressure switch for blockage or obstruction.
• Inspect the burner. Reference this manual for removal
and cleaning procedures. Replace if necessary.
• Inspect the heat exchanger. Reference this manual
for removal and cleaning procedures.
necessary.
• Faulty air pressure switch. Replace switch.
• Verify combustion air blower is operating. Replace if
necessary.
• Check/replace filter.
Service Manual
Clean if
Operation
Manual
for
Replace if
45
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