lp-672 Rev. 000 Rel. 002 Date 10.3.18
53
DIAGNOSTICS AND SUGGESTED CORRECTIVE ACTIONS
The water heater control is able to record information about the water heater’s condition at the time of the ten previous faults or errors. This
information is available to view in the Installer Mode under the History screen.
The following screens may be displayed when reviewing the water heater history. The table below also includes diagnostic information and
possible corrective actions.
Display
Condition
Diagnostic
Possible Corrective Actions
Nothing appears on the
display control panel but
the fan runs at full speed
Control is not
receiving power
Check wiring for short circuit or incorrect
wiring
Correct wiring per wiring diagram
including connection of transformer to
the control.
Check transformer connection to the
control per wiring diagram. Check for 14V
output of panel wire.
Push the Power button on the control
panel
Nothing appears on the
display control panel
and no other water
heater components are
operating
Control is not
receiving 120V
power
Ensure service switch and/or circuit
breaker to water heater is turned ON
Turn on service switch or circuit breaker to
power water heater
Is there 120V at the service switch
Troubleshoot and correct the power
supply to the manual switch
Is the ON/OFF switch inside the water
heater cabinet is turned on
Turn ON the manual power switch inside
the water heater cabinet
Check for 120V at the line voltage terminal
block located inside the water heater
cabinet
Correct wiring inside the water heater
cabinet using the wiring diagram in the
installation manual
Inspect the fuse. Replace as necessary
Replace the fuse with the proper part
found in the replacement part section of
this manual. If fuse blows again, recheck
the wiring per diagram
Nothing appears on the
display control panel,
but the water heater is
operating
Occurs when
communications is
lost from the control
to the display
Check for loose connections and proper
pin alignment / engagement on the
control’s plug
Check for continuity on the wire harness
from the display to the control. See repair
parts section for proper replacement part.
Cycle power off and on using water heater
power switch and check for operation
Replace with new display module.
See repair parts section for proper
replacement part.
Display repeatedly goes
through initialization
sequence
Occurs when control
does not receive
signal from fan
Cycle power off and on using appliance
power switch and check for operation
Replace fan
Table 28 - Diagnostics and Suggested Corrective Actions
