Service Manual

13
13
120 volt potential exposure. Use caution making
voltage checks to avoid personal injury.
WARNING
Use caution to not damage connectors when making
voltage measurements or jumping terminals.
CAUTION
Troubleshooting
System Observations
Water Heater Fault: Water heater does not operate
Display Error Code: Water heater display does not
operate - blank display
Refer to control board
illustration. Voltage at connector
location J8 across blue and
yellow wires should be 24VAC.
If not, check transformer.
Replace transformer if defective.
Does water heater display
operate? Increase thermostat
setting if tank is warm.
Is 24VAC present between
RED and BLACK wire pin
connections on the back of
control display?
Display operates – see next page.
Display operates – see next page.
Replace
control board.
Check wire
harness for proper
continuity.
Check wires for proper
termination to control display.
Are wire terminations connected
properly to control display?
Replace
control
board.
Make proper wire
terminations.
Y
Y
Y
Y
N
N
N
N
black & white wires
Check main power supply to water heater –
fuse, circuit breaker, plug receptacle, line cord or
wiring to water heater.
Refer to control board
illustration. Voltage at
transformer across black and
white wires should be 110-
120 VAC. Check line cord
with volt meter. Replace line
cord if defective.
Check to make sure switch on front of control
panel is in the ON position.
Verify secondary voltage at the control board.
Verify primary voltage at the transformer.
yellow
& blue
wires