DIY Series 45: Alpha EVO-i Fixing (Test/Reset & Heater)

Symptoms:

• Test and Reset Button for ELCB trip check is not working
• Heater LED is not ON, thus heater is not working

Findings:

• Test & Reset Board (Board Model: SW-G) is malfunction
• ELCB Board (Board Model: E2N) is malfunction

Photos:

1. Block Diagram of Alpha EVO-i Water Heater
2. Location of malfunction board (ELCB Board: E2N)
3. Location of malfunction board (Test & Reset Board: SW-G)
4. Faulty Push Button Switches of "Test" & "Reset"
5. Faulty Parts on ELCB Board (Electrolytic Cap 470uF, CBB21 1uF, Varistor 14D471K)

Video (After Fixing):

• 0:00:08: Testing on Test / Reset Button
• 0:00:13: Testing on Heater LED ON
• 0:00:23: Testing on Test / Reset Button
• 0:00:28: Testing on Heater LED OFF
• 0:00:40: Testing on water supply cut-off, Heater LED OFF
• 0:00:42: Testing on water supply resume, Heater LED ON

Tools required:

• Multimeter, screwdriver, plier and soldering iron

Costs involved:

• Push Button Switches (2pcs): US$0.05 x 2 = US$0.10
• Electrolytic Cap 470uF: US$0.10
• Varistor 14D471K: US$0.10
• CBB21 1uF (105J630V): US$0.35

Note:

• New ELCB Board (Model: E2N): US$18 ~ US$20
• New Alpha EVO-i Water Heater: US$100 ~ US$120