NTI
Slow Pressure Loss
Boiler frequently loses pressure over days or weeks without obvious leaks
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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
Micro‑leaks in system piping, Leaking automatic air vent, Faulty expansion tank Schrader valve, Internal leak in plate heat exchanger
How to Fix / Troubleshooting
Safety: Do not ignore chronic pressure loss; it can lead to air ingress and corrosion.
- Inspect vents and joints: Look for dried mineral deposits around air vents, joints, and valves indicating slow leaks.
- Expansion tank check: Test the air charge in the expansion tank with the system depressurized. Recharge or replace if low or leaking.
- Isolate boiler: Close isolation valves to the system and monitor boiler pressure. If it still drops, the leak may be within the boiler or plate heat exchanger.
- Professional leak detection: A technician can perform pressure tests and dye or tracer gas tests to locate hidden leaks.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Air Vent
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