E15
CTC
Water Leak / Safety Float Switch Activation
Boiler displays E15; internal leak or water detected in base tray.
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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
Leaking pump seals, Leaking automatic air vent, Corroded heat exchanger, Loose compression fittings inside boiler
How to Fix / Troubleshooting
Safety: Switch off power and close the system isolation valves. Water inside the boiler can damage electrical components.
- Inspect base tray: Remove the front cover and check the base of the CTC boiler for standing water. Mop up with absorbent cloths.
- Locate leak source: With the system repressurised (if safe), visually inspect around the pump, automatic air vent, heat exchanger connections, and manifold for drips.
- Tighten fittings: Carefully tighten any accessible compression joints that are weeping. Do not overtighten plastic components.
- Replace faulty components (technician): If the leak is from the pump, AAV, or heat exchanger, replace the affected part following CTC service instructions.
- Dry electronics: If water has contacted the PCB or wiring, allow to dry fully and inspect for damage. Replace any corroded components.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Air Vent
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