User Guide

3 Troubleshooting
Table 3F Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT DESCRIPTION CORRECTIVE ACTION
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, or the O-temp heat exchanger 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. Refer to Section 3 - General Venting of the
Armor Wall Mount 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 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.
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Service Manual