Use and Care Manual

Table 27 – 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.
PART 12
Troubleshooting
TROUBLESHOOTING CHART
POSSIBLE CAUSES
POSSIBLE REMEDIES
PROBLEM
No electrical power
to the water heater
No water available
when a faucet is
opened
Hot water is not
available when the
faucet is opened.
The water
temperature is not
hot enough or turns
cold during use.
It takes a long time
before hot water
flows from the
faucet.
The water is not hot
enough.
The water at the
faucet is too hot.
A fan can be heard
even when the unit is
not operating.
White “smoke” can
be seen coming out of the
exterior exhaust gas vent.
1. Is the faucet open enough to draw at least 0.6 gallons
(2.3L) per minute through the water heater?
2. Is an error code flashing on the display panel?
3. 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).
1. Allow time for the cold water already in the pipes to flow
from the faucet.
2. Have recirculation valves and/or plumbing return line(s)
installed and program the unit for recirculation mode.
Adjust the temperature setting.
Adjust the temperature setting.
1. This is normal operation – no action is required.
2. Protect the water heater from freezing temperatures or
shut off and drain the unit.
This is normal operation – no action is required.
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.
1. Is the plug on the power supply cord unplugged from the
electrical outlet?
2. Is electrical panel’s 10 Amp 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
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.
Is the faucet some distance from the water heater?
Is the water temperature set too low?
Is the water temperature set too high?
1. The fan continues to operate after the burner shuts
off to clear the exhaust vent of combustion gases.
2. The fan may run to help prevent freezing.
Depending on the outside temperature, water vapor
can be produced as the exhaust is vented.
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