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12
Troubleshooting
Table 12F Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT
MEMORY
ERROR
FAN SPEED
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
Flow Switch/
LWCO
(will require a manual
reset once condition has
been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
FLAME
SEQUENCE
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
72
DESCRIPTION
The control module has detected parameter
settings that are corrupted.
The actual fan RPM is outside of the tolerance
of the fan speed RPM target.
Blown fuse.
The low water cutoff (LWCO) is not making.
Blown fuse.
The flame detector circuit is seeing a flame
signal when the gas valve is OFF.
Installation & Service Manual
CORRECTIVE ACTION
• Replace control module.
• Vent/air intake lengths exceed the maximum allowed
lengths. Refer to Section 2 - General Venting for
proper lengths.
• Check for obstruction or blockage in the vent/air
intake pipes or at terminations.
• Check the wiring connections at the fan and at the
main control board.
• Replace the fan.
• Replace the main control board.
• Replace fuse F2 on the control board, see page 68
of this manual.
• 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 a loose or misplaced jumper if flow switch
is not installed.
• Replace LWCO.
• Replace fuse F3 on the control board, see page 68
of this manual.
• Verify flame is not present. If present, turn off gas
supply and replace gas valve.
• Check supply voltage for proper polarity.
• Check external wiring for voltage feedback.
• Check the flame rod and make sure it is clean.
• Check the internal wiring for bad connections.
• Replace main control board.
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Table of Contents
Troubleshooting
