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What are the error codes mean of Instant Water Warmer FD03 and what should do?

Error Code

Meanings

E1

NTC2 abnormal time-limited protection

E2

NTC1 over-temperature protection (dry-burn protection)

E3

NTC1/NTC2 short-circuit protection

E4

NTC1/NTC2 open-circuit protection

E6

Over-voltage protection

E7

zero-crossing protection

If your device displays the error codes above, please restart the device and try a different, stable power outlet. If the problem continues, escalate to the manual support for help.