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ERROR CODE INDICATES CORRECTIVE ACTION*
021 with an alert Icon flashing.
(also flashing red LED and beeper.)
Upper element circuit failure.
NOTICE: Lower element is still operable.
1. Turn off electrical power at the breaker.
2. Check element circuits for resistance of 5-25 ohms (replace if required).
3. Check wires at elements and thermostat for damage.
4. Turn on electrical power at breaker.
5. If the error persists, contact a qualified person.
NOTICE: The control panel will go into limp mode until the failure is cor
rected. See page 22.
022 with an alert Icon flashing.
(also flashing red LED and beeper.)
Lower element circuit failure.
NOTICE: Upper element is still operable.
1. Turn off electrical power at the breaker.
2. Check element circuits for resistance of 5-25 ohms (replace if required).
3. Check wires at elements and thermostat for damage.
4. Turn on electrical power at breaker.
5. If the error persists, contact a qualified person.
NOTICE: The control assembly will go into limp mode until the failure is cor
rected. See page 22.
006 with an alert Icon flashing.
(also flashing red LED and beeper.)
Internal Processor Error
- Frequency Fault
- Standard AD Reference Fault
- Non-Volatile Memory Fault
1. Turn off electrical power at the breaker. Now turn on electrical power to
see if error clears. If error has not cleared, replace the control panel.
2. Turn on electrical power at breaker.
031 with an alert Icon flashing.
(also flashing red LED and beeper.)
Water Leak 1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Check for plumbing leaks and correct accordingly.
3. If tank is leaking, replace the unit.
4. Turn on electrical power at breaker.
046 with an alert Icon flashing.
(also flashing red LED and beeper.)
Shut-off Valve Error (If applicable) 1. Turn off electrical power. Shut off the cold water valve at the main line
and open a hot water faucet to release pressure from the water heater.
2. Check the cut-off valve, making sure the valve is not stuck in the
open or closed position.
3. Replace the shut-valve, if needed.
4. Turn on electrical power at breaker.
5. Open the cold water valve to fill the heater with water, open a hot water
faucet to bleed all air until water flows without air bursts.
101 with an alert Icon flashing.
(also flashing red LED and beeper.)
Upper Thermostat Error 1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Replace the thermostat.
3. Turn on electrical power at breaker.
102 with an alert Icon flashing.
(also flashing red LED and beeper.)
Lower Thermostat Error 1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Replace the thermostat.
3. Turn on electrical power at breaker.
045 with an alert Icon flashing.
(with flashing red LED.)
Battery Low Energy 1. Make sure the battery protective tab has been properly removed from
the battery tray, located on the left side of the control assembly.
2. Located the battery tray on the side of the control assembly.
3. Remove the the phillips head screw, slide the battery tray out from the
control assembly.
4. Remove the old BR2032 battery and replace with a new Panansonic®
BR2032 or Murata CR3032 battery.
5. Reinstall the battery tray with new battery and hand tighten the phillips
head screw to secure the battery tray in the control assembly.
NOTICE: If the control assembly was not connected via WiFi or powered
by a power source, the time will need to be set.
Residen al Electronic Thermostat Electric Water Heater Use and Care Guide • 21
TROUBLESHOOTING
TROUBLESHOOTING
*These instructions are brief and intended as guidance for a qualifi ed person. If you lack the necessary skills to perform
these procedures call
Technical Assistance Hotline which is listed on the water heater’s warranty sheet for assistance.
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