Oso Intermittent Thermostat or Control Fault

Oso water heater does not restart heating after hot water is drawn; requires manual reset or power cycle.

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

Sticky control thermostat contacts, Failing safety thermostat, Loose control wiring, Control PCB relay sticking

Safety first: Isolate power before accessing the control compartment.

Observe behavior: Note whether the thermostat click is heard when temperature drops, but the heater does not energize.
Check wiring: Tighten all thermostat and control connections.
Test thermostat continuity: Replace the control thermostat if it fails to close reliably when calling for heat.
Control PCB: If the thermostat is working but the element is not energized until power is cycled, the control PCB relay may be sticking and should be replaced.

Medium 3/5

Oso control thermostat

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