Oso No Display / UI Power Failure

Oso water heater’s digital display is blank, but power is present at the unit.

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.

Possible Causes

Blown low‑voltage fuse on PCB, Failed display module, Loose low‑voltage connector, Faulty internal power supply

Safety first: Turn OFF power and verify isolation before removing covers.

Confirm supply: Use a multimeter to verify mains voltage at the heater’s terminal block.
Inspect fuses: Look for any small fuses on the control PCB and test/replace with identical ratings if blown.
Check connectors: Ensure the display module’s connector is firmly seated on the PCB.
Replace display or PCB: If low‑voltage power is present but the display remains dead, replace the Oso display module. If no low‑voltage output, replace the control PCB.

Hard 4/5

Oso display and user interface module

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