Nibe
Short Cycling / Control Instability
Water heater cycles on and off rapidly, with short heating periods and frequent restarts.
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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
Incorrect differential or hysteresis settings, sensor placed in wrong position, oversized heater relative to cylinder volume, faulty thermostat
How to Fix / Troubleshooting
Safety first: Avoid frequent manual power cycling; let the controller manage operation once configured.
- Step 1 – Check settings:
- In the installer menu, verify that the temperature differential (hysteresis) is set to a reasonable value (e.g. 5–10 °C).
- Step 2 – Sensor placement:
- Ensure the main tank sensor is in the correct pocket and not too close to the heater element.
- Step 3 – Observe operation:
- Monitor how long the heater runs before stopping; if only a minute or two, a control or sensor fault is likely.
A Nibe technician may need to adjust advanced parameters or replace a faulty thermostat/sensor to resolve short cycling.
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Repair Difficulty
Medium
3/5
Required Part
Tank Temperature Sensor (NTC)
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