lp-673 Rev. 000 Rel. 001 Date 8.30.18
45
C. Suggested Corrective Actions
Problem
Possible Causes
Possible Remedies
No electrical power to the water
heater
1. Is the plug on the power supply cord unplugged
from the electrical outlet?
2. Is the circuit breaker tripped?
3. Is the fuse on the circuit board good?
4. Is there a power outage to the home?
1. Reset the plug.
2. Reset the circuit breaker.
3. If the display panel is blank, unplug the unit or
contact an authorized service technician.
4. Contact the power company.
No water available when faucet
is opened
1. Is the water supply valve shut off at the meter (do
cold water faucets work)?
2. Is the water supply valve near the unit open?
3. Is the water pipe frozen?
4. Is an error code flashing on the display panel (leak
detected)?
1. Open the closed supply valve.
2. Open the water supply valve.
3. Turn OFF the unit, close all water valves and
the gas valve. Contact an authorized service
technician.
4. Refer to error code information and contact an
authorized service technician.
Hot water is not available when
a faucet is opened
1. Does the water heater have power (plugged in)?
2. Is the water heater turned ON?
3. Is an error code flashing on the display panel?
4. Is the gas supply valve open or shut off at the
meter (do other gas devices work)?
1. Restore electrical power to the unit.
2. Press and hold the Power button to turn the
unit ON.
3. Refer to the Diagnostic and Error Codes section
in this manual.
4. Open the gas supply valve.
The water temperature is not hot
enough or turns cold during use
1. Is an error code flashing on the display panel?
2. Is the outlet water temperature set too low?
1. Open the faucet to allow more water flow.
2. Refer to the Diagnostic and Error Codes section
in this manual.
3. Adjust the outlet water temperature (refer to
the procedure in this manual).
It takes a long time before hot
water flows from the faucet
Is the faucet some distance from the water heater?
1. Install a recirculation line.
2. Allow time for the cold water already in the
pipes to flow from the faucet.
The water is not hot enough
Is the water temperature set too low?
Adjust the temperature setting.
The water at the faucet is too hot Is the water temperature set too high?
Adjust the temperature setting.
A fan can be heard even when
the unit is not operating
1. The fan operates after the burner shuts off to clear
combustion gases from the exhaust vent.
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 off 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 30 - 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 but
the fan runs at full
speed
Control is not
receiving power
Check for incorrect or short circuited 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 heater cabinet using
the wiring diagram in the installation manual
Inspect the fuse. Replace as necessary
Replace the fuse. See replacement parts
section for part number. If fuse blows again,
recheck the wiring per diagram.