LP-605 Rev. 000 Rel. 009 Date 8.16.18
46
Problem Possible Causes Possible Remedies
It takes a long time before hot
water ows from the faucet
Is the faucet some distance from the water heater?
1. Allow time for the cold water already in the
pipes to ow from the faucet.
2. Have recirculation valves and/or plumbing
return line(s) installed and program the unit for
recirculation.
The water is not hot enough
Is the water temperature on the thermostatic
mixing valve set too low?
Adjust the temperature setting.
The water at the faucet is too hot
Is the water temperature on the thermostatic
mixing valve set too high?
A fan can be heard even when the
unit is not operating
1. The fan continues to operate after the burner
shuts o to clear the exhaust vent of combustion
gases.
2. The fan may run to help prevent freezing.
1. This is normal operation – no action is
required.
2. Protect the water heater from freezing
temperatures or shut o and drain the unit.
White “smoke” can be seen coming
out of the exterior exhaust gas
vent
Depending on the outside temperature, water
vapor can be produced as the exhaust is vented.
This is normal operation – no action is required.
Table 28 - Troubleshooting Chart
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 5P wire connection to the Fan Motor
per wiring diagram
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 o 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 o and on using appliance
power switch and check for operation
Replace fan
Table 29 - Diagnostics and Suggested Corrective Actions
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