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TROUBLESHOOTING
CAUTION
Use Caution Not to Damage Connectors when making Voltage Measurements or Jumping Terminals
Water Heater Fault: Water heater does not operate
Display Error Code: Water heater display does not operate - blank display
Check main power supply to water
heater - fuse, circuit breaker, plug
receptacle, line cord or wiring to
water heater.
Check to make sure switch on top of
control panel is in the ON position
Verify Primary and Secondary
voltage at the control board.
Voltage at primary pins 1&3 should be
110-120. If not, check Line In pins 1&4.
Check line cord with volt meter.
Replace line cord if defective.
If there is not 24 volts at Secondary
pins on the control board, check
transformer. Replace transformer
or wire harness.
Does water heater display operate?
Does the induced draft blower start
to operate? Increase thermostat
setting if tank is warm.
Check wire connections of
board to display. See
illustration.
With the control cover tilted down,
measure the voltage between red and
black wire pin connections to display.
Voltage should be 24 volts AC
measured at the back of the Control
Display.
If no voltage at Display, check wire
harnesses and voltage at E-com
screw terminals on the Control Board.
Replace control display if voltage is
present at back of display pin terminals
(see photo at left). Replace control board if
no voltage is present at E-com terminals
(1&3 and 1&2) to the control display.
N
N
See next page
Switch on power.
Checking primary voltage to
transformer from board. Pins to
black and white wires.
Checking line voltage to board.
Pins to black and white wires.
Checking secondary voltage from
transformer. Pins to blue and yellow
wires.
Checking transformer voltage, front
terminals are 24 volts, rear terminals
are 120 volts.
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