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Sakura SH-106 water heater cannot power on

 the keypad is not functioning


the power button, marked OPER, is damaged by water ingression.

the IC is CD4511BE

7 segment is HLB W256R-CC1R 

transistor is K439 C119 (Si NPN)

cost you hkd 360 for parts replacement

diagnostics:



if other parts of water heater is not working, can check by turning on hot water, an error code will show up

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