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Residenal Electric Water Heater Use and Care Guide • 25
TROUBLESHOOTING
CONTROL ASSEMBLY DIAGNOSTIC
CODE CHART
IMPORTANT: Before aempng to adjust the thermostat, read
the “Important Safety Informaon” secon on page 4. If the
instrucons are not clear, contact a qualied person.
ENTER
Error
Code
Battery
Tray
Figure 31 - Control Assembly Diagnostic Coding.
ERROR CODE INDICATES CORRECTIVE ACTION*
No Error Code Displayed
Not Enough Hot Water
High usage, plumbing leak, operating mode
adjustment
1. Check for plumbing leak.
2. Adjust temperature; see scald warnings on
heater and in manual.
3. Contact a qualified person to perform a volume
test.
No Error Code Displayed
Water Too Hot
Water temperature set too high or grounded element 1. Reduce temperature setting; or
2. Turn off electrical power at the breaker.
3. Check element circuits for resistance of 5-25
ohms (replace if required, see page 34).
4. Turn on electrical power at breaker.
5. If the error persists, contact a qualified person.
No Error Code Displayed
No Hot Water
No power, control panel or thermostat operation 1. Turn off electrical power at breaker.
2. Unplug and reconnect 24 pin connector.
3. Turn on electrical power at breaker.
4. Contact a qualified person to verify correct
voltage to unit.
NOTICE: If the control panel was not connected via
Wi-Fi or Bluetooth, the time will need to be set.
001 with an alert Icon flashing.
(also flashing red LED and beeper.)
Dry-fire, electrical power on with the tank not
completely full of water
1. Turn off electrical power at breaker. Add water,
open a hot water faucet to bleed all air until
water flows without air bursts.
2. Turn on electrical power at breaker.
3. See “Important Safety Information” on page 4.
003 with an alert Icon flashing.
(also flashing red LED.)
Upper thermistor sensor failure
NOTICE: Upper thermistor sensor is mounted to tank
and located above upper element
1. Turn off electrical power at the breaker.
2. Check electrical connections at Control
Assembly board.
3. If there are no issues with the wiring, replace
the thermistor.
4. Turn on electrical power at breaker.
NOTICE: The Control Assembly will go into Limp
Mode until the failure is corrected. See page 28.
004 with an alert Icon flashing.
(also flashing red LED.)
Lower thermistor sensor failure
NOTICE: Lower thermistor sensor is mounted to tank
and located above lower element
1. Turn off electrical power at the breaker.
2. Check electrical connections at Control
Assembly board.
3. If there are no issues with the wiring, replace
the thermistor.
4. Turn on electrical power at breaker.
NOTICE: The Control Assembly will go into Limp
Mode until the failure is corrected. See page 28.
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
- Crystal 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
assembly.
2. Turn on electrical power at breaker.
009 with an alert Icon flashing.
(with flashing red LED.)
Power supply voltage is too low or too high Check for loose electrical connections, refer to
“Power Cycling the Unit” on page 31.
TROUBLESHOOTING
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