E24
Atlantic
Manual Reset Safety Thermostat Tripped
Boiler shows E24, often after overheating events or repeated lockouts.
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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
Serious overheating of primary heat exchanger, Pump failure, Blocked system, Faulty or bypassed safety devices
How to Fix / Troubleshooting
Safety: Do not repeatedly reset an overheating boiler without finding the cause. Risk of damage or fire.
- Allow full cooling: Turn off power and wait until the boiler is completely cool.
- Reset thermostat: Locate the manual reset overheat thermostat (usually a red button on the heat exchanger area) and press gently until it clicks.
- Check circulation: Ensure all valves are open, pump is running, and filters are clean.
- Professional investigation: A technician must identify why the overheat occurred (blocked exchanger, pump failure, incorrect settings) before returning the boiler to normal use.
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Repair Difficulty
Hard
4/5
Required Part
Manual Reset Overheat Thermostat
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