Oso
Inlet Control Group Leak
Oso water heater leaking from the cold inlet combination valve or its connections.
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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
Failed pressure reducing valve seal, Loose compression fittings, Debris under non‑return valve seat, Corroded inlet group body
How to Fix / Troubleshooting
Safety first: Turn OFF the cold water supply to the heater and relieve pressure via a hot tap before working on the inlet group.
- Identify leak point: Dry the area and observe where water emerges—at joints, from the relief outlet, or from the valve body.
- Tighten joints: Carefully tighten compression nuts or threaded joints, taking care not to overtighten.
- Clean or replace components: If the leak is from the relief outlet, the internal seat may be fouled. Many Oso inlet groups are replaced as a complete assembly rather than serviced.
- Replace inlet group: If the body is corroded or seals have failed, remove and replace the entire Oso cold inlet combination valve assembly.
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Repair Difficulty
Hard
4/5
Required Part
Oso cold inlet combination valve
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