Corrective Action - Lochinvar 151 - 801 Service Manual

3
Troubleshooting
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT
The unit was running and lost the flame
signal. This condition occurred four (4)
straight times.
Exception: Models 501 - 801 will lock out
after one retry for ignition. It will require a
manual reset before attempting to fire again.
No Flame
Running
(will require a manual
reset once the condition
has been corrected.
Press the RESET
button on the SMART
SYSTEM display to
reset.)
30
DESCRIPTION
Outdoor Armor Water Heater Service Manual

CORRECTIVE ACTION

• Check wiring harness connection at the gas valve and
at the main control board.
• Inspect spark electrode and associated wiring for
damage and connection. Reference page 22 of this
manual for removal and cleaning procedures. Replace
if necessary.
• Check for proper electrical grounding of unit.
• Check incoming supply gas pressure.
pressures should be between 4 - 14 inches w.c. and
LP gas pressures should be between 8 - 14 inches
w.c. Refer to Section 4 - Gas Connections of the Armor
Outdoor Water Heater Installation and Operation
Manual 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.
• 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.
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
Reference page 22 of this manual for removal and
cleaning procedures. Replace if necessary.
• Inspect the burner. Reference page 22 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Replace the main control board.
Natural gas
When the valve is
and associated wiring.