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Does induced draft blower
operate?
Error code #29 on display. Measure voltage at the pin
terminals on the control board between the black and white
wires to the blower (terminals 5 and 3 on the “inducer”
output on the board, see image above). Make sure the
control display shows “heating” in the status mode.
Increase the setpoint, if it does not show “heating”. Is there
110-120 volts to the blower harness?
Replace control board if display
shows “heating” and no voltage is
present to the blower harness.
Make sure there are no codes for
the temperature sensors
(following sections) before
replacing control board.
If there is voltage from the
control board to the blower wire
harness? Check the voltage at
the connection to the blower.
Replace wire harness if there is
no voltage to the blower.
Replace blower, if there is
voltage to the blower.
Is there pilot flame?
Error code #29 on display. Pressure switch did not close. Check for
blocked intake or exhaust vents, damper stuck closed, or excessive
vent length. See section on “Checking Pressure Switch”. If pressure
switch closes, and error code 62 appears on control display, pilot is not
lighting or staying lit during the ignition cycle. Proceed to the section
“Pilot Operation Testing”
Does Main Burner operate?
Error code #62 on display. See pilot lights, no flame
signal in the section for “Pilot Operation Testing”
Does burner continue until
thermostat set point is reached?
See setting display in Service Mode
and displaying temperature
sensors.
Error code #63 on display. See Main Burner short
cycles in the section under “Main Burner Operation
Testing”
Blower Stops shortly after burners
shut off.
System okay
TROUBLESHOOTING
CAUTION
Use Caution Not to Damage Connectors when making Voltage Measurements or Jumping Terminals
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From previous page
Example of error code shown on control display.
SELECT Lockout RESET
Status
Service Needed
Error Code Shown
in Water Heater Display
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