Install Instructions

66
12 Troubleshooting
Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater
Interface
Installation & Service Manual
ERROR CODE DESCRIPTION CORRECTIVE ACTION
E08
Louver proving switch open.
• Check wiring to louver proving switch.
• Check louver proving switch.
E09
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.
E11
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
The unit has lost flame signal four (4) times
during a call for heat.
• Inspect spark electrode and associated wiring for
damage and connection. Reference page 57 of this
manual for removal and cleaning procedures.
Replace if necessary.
• Check for proper electrical grounding of the 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 6 - 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 correctly
installed and that 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 Gas Valve or Gas Valve 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 57 of this manual for removal and
cleaning procedures. Replace if necessary.
• Inspect and clean the heat exchanger as necessary.
Reference page 58 of this manual for cleaning
procedures.
• Inspect the burner. Reference page 58 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Replace the main control board.
E12
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
The unit has failed to prove main burner
ignition after four (4) attempts.
n05
The fan speed is being increased due to the
flame current going below 5 microamps.