BWT No Power / Dead Control Panel

Heater will not start at all; display is blank and unit appears dead

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Tripped circuit breaker, Blown internal fuse on BWT control board, Loose power supply wiring, Failed main control board power supply

How to Fix / Troubleshooting

Danger: High voltage present. Only perform basic checks if you are comfortable and qualified.

  • Check breaker: Verify that the dedicated breaker for the BWT heater is ON and has not tripped. Reset if necessary.
  • Inspect disconnect: Ensure any external disconnect switch near the heater is in the ON position.
  • Verify power at unit: If qualified, measure voltage at the heater’s input terminals to confirm power is present.
  • Check internal fuse: With power off, open the control panel and look for an internal fuse on the PCB. Replace only with the same type and rating if blown.

If the display remains blank with confirmed correct power and a good fuse, the main control board’s power supply is likely faulty and the board should be replaced by a technician.

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Repair Difficulty

Hard 4/5

Required Part

BWT Main Control Board (PCB)
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