lp-672 Rev. 000 Rel. 002 Date 10.3.18
52
3. Recirculation / Inlet / DHW / Operating Temperature / Exhaust Sensors
Figure 61 - Recirculation / Inlet / DHW / Operating Temperature Sensors Error Analysis Tree
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 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.
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. If recirculation or preheat modes are OFF, is the
faucet open enough to draw at least 0.5 gallons
(2.2L) 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. Activate preheat or internal recirculation
modes.
2. Open the faucet to allow more water flow.
3. Refer to the Diagnostic and Error Codes sec-
tion in this manual.
4. Adjust the outlet water temperature (refer to
the procedure in this manual).
It takes a long time before hot
water flows from the faucet
1. Is the faucet some distance from the water
heater?
2. Are recirculation or preheat modes ON?
1. Activate preheat or internal recirculation
modes.
2. Have recirculation valves and/or plumbing
return line(s) installed and program the unit for
external recirculation mode.
3. 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 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.
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 27 - Troubleshooting Chart
