Troubleshooting
12
Problem
Possible Cause(s)
Solution
• No LED display
Heater is not plugged in
Plug in the heater
on unit
Thermal cutout trips
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• No hot water,
No power supply in power
Check the power socket
no display
socket on the wall
Control circuit or internal
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wiring error
• Display, no hot water
Heating element(s)
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breakdown or internal
wiring error
Check the “Auto On” &
Change the “Auto On” &
“Auto Off” time
“Auto Off” time
• Water temperature
Electronics circuit damaged
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is too high
• Piping connection
Connection not sealed
Re-connect piping, using tape
leaks
thread sealant.
Refer plumbing instructions on
pages 3 & 4
• Water leakage
Leakage in tank or
Shut off power immediately and
from product
other parts
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• LED display
Leakage of electricity
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error code “E0”
• LED display
Temperature sensor circuit
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error code “E1”
short or open
• LED display
Extra high temperature
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error code “E3”
• LED display
Malfunction of leakage
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error code “E4”
circuit
• LED display
High/Low voltage protection Use after voltage returns to
error code “E5”
(<100 V & >275 V)
normal
Circuit Diagram
Black
Black
Blue
Thermal Cutout
Power
Board
Element
Element
Green/Yellow
Red
Red
Red
Brown
Control
Board
