CAUTIONUse Caution Not to Damage Connectors when makin g Voltage Measurements or Jumping TerminalsWater Heater Fault: Water heater does not operateDisplay Error Code: Water heater display does not operate - blank display
Check main powersupply to water
heater - fuse,circuit breaker, plug
receptacle, line cordor wiring to
water heater.
Check tomake sure switch on top of
controlpanel is in the ON position
VerifyPrimary and Secondary
voltage at the control board.
Voltage atprimary pins 1&3 (white and
black wires) should be 110-120. If not,
check Line In pins 1&4. Check line cord
with ohmeter. Replace line cord if
defective.
If there isnot 24 volts at Secondary
pinson the control board, check
transformer. Replace transformer
or wire harness.
Does waterheater display operate?
Does damper begin toopen?
Increase thermostat settingif tank is
warm and make surethe control
display status reads “Heating”.
Check wireconnections of
board to display. See
illustration.
Withthe control cover tilted down,
measure the voltage between red and
black wire pin connections todisplay.
Voltage should be 24 volts AC
measured at theback of the Control
Display.
If no voltage at Display, check wire
harnesses and voltage at E-com
screw terminals (see photo 5).
Replace display if voltage is presentat
display pin terminals. Replace control
boardif no voltage is present at E-
comtermin als (1&3, white-black wires
and 1&2, white-red wires) to display.
N
Y
See nextpage
Checking primary voltageto
transformerfrom board. Pins to
black and white wires.
Checking line voltage to board.
Pins to black and white wires.
Checking secondaryvoltage from
transformer. Pins to blue and yellow
wires.
Checking transformer voltage,front
terminalsare 24 volts, rear terminals
are 120 volts.
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Troubleshooting
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