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13 Troubleshooting (continued)
Table 13E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater
Interface
FAULT DESCRIPTION CORRECTIVE ACTION
No Flame
Running
(will require a manual
reset once the
condition has been
corrected. Press the
RESET button on the
display to reset.)
The unit was running and lost the flame
signal. This condition occurred four (4)
straight times.
• Inspect spark electrode and associated wiring for
damage and connection. Reference page 56 of this
manual for removal and cleaning procedures.
Replace if necessary.
• Check for proper electrical grounding of unit.
• Check incoming supply gas pressure. 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 for
detailed information concerning the gas supply.
• Verify that the plastic hose from the gas valve to the air
inlet is connected and is not damaged.
• Verify that the vent/air intake pipes are installed
correctly and there are no obstructions.
• Check for 24 VAC to the gas valve at the 2-pin
connection on the side of the main control board
during the ignition attempt. If no voltage is present,
replace the main control board.
• If 24 VAC is present at the main control board, check
the wiring between the main control board and the gas
valve. Replace the wiring if necessary. Do not
disconnect the wiring from the gas valve and attempt
to measure voltage at that point. The main control
board can detect if the gas valve is not connected and
will display the GV / Relay Fail fault.
• If 24 VAC is present, check the outlet of the valve to
ensure the valve is flowing gas. With a manometer
connected to the outlet tap of the gas valve, when the
unit is in the prepurge period, there should be a
negative pressure present. When the valve is
energized a change in pressure should occur. If the
pressure change does not occur, the gas valve is not
opening. Replace the gas valve.
• Inspect flame sensor and associated wiring.
Reference page 56 of this manual for removal and
cleaning procedures. Replace if necessary.
• Inspect the burner. Reference page 56 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Replace the main control board.
GV/Relay
Fail
(will require a manual
reset once the
condition has been
corrected. Press the
RESET button on the
display to reset.)
The main control board did not detect the
gas valve.
• Ensure gas valve switch is ON (Models SNR150-100
and SNA285-125).
• Check wiring harness connection at the gas valve and
at the main control board.
• Replace the gas valve wire harness.
• Replace the gas valve.
• Replace the main control board.
Installation & Service Manual
TM