Oso Short Cycling / Poor Temperature Differential

Oso water heater cycles on and off rapidly, with small temperature swings and frequent relay clicks.

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Possible Causes

Thermostat differential too narrow, Sensor located too close to element, Oversized heater for demand, Control algorithm misconfigured

How to Fix / Troubleshooting

Safety first: Turn OFF power before adjusting internal controls.

  • Check thermostat spec: Ensure the installed thermostat is the correct Oso part with proper differential.
  • Verify sensor placement: Confirm the sensor is in the correct pocket and not directly touching the element.
  • Adjust settings: If the control allows, increase the temperature differential or anti‑short‑cycle time as per the manual.
  • Monitor operation: After adjustments, observe several cycles to confirm improved behavior.
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Repair Difficulty

Easy 2/5

Required Part

Oso control thermostat
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