Oso Overheating Electrical Components

Oso water heater emits a plastic or burning smell during operation.

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

Loose electrical connections causing arcing, Undersized or damaged wiring, Failing relay or contactor, Foreign material near element

Safety first: Immediately turn OFF power if you smell burning. Do not operate the heater until inspected.

Inspect wiring: Remove covers and look for discolored, melted, or charred insulation at terminals and on the PCB.
Tighten terminals: Tighten any loose screws on the terminal block, thermostat, and element connections.
Replace damaged parts: Replace any burned connectors, relays, or wiring with Oso‑approved components.
Check for obstructions: Ensure no plastic or debris is in contact with the element or hot surfaces.

Hard 4/5

Oso wiring harness and terminal block

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