Vokera
Short Cycling / Intermittent Operation
Boiler randomly turns off and on, or cuts out before reaching set temperature
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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
Oversized boiler for system, Blocked or closed radiators, Incorrect pump speed, Faulty temperature sensor or PCB hysteresis
How to Fix / Troubleshooting
Safety first: No immediate hazard, but efficiency and comfort are affected.
- Open radiators: Ensure enough radiators are open to dissipate boiler output.
- Check thermostat location: Avoid placing room stat near heat sources or in direct sunlight.
- Engineer tasks:
- Adjust pump speed and check bypass.
- Verify sensor readings and replace if faulty.
- Review boiler output settings and reduce maximum CH output if the model allows.
Persistent short cycling can reduce boiler lifespan and should be optimised by an engineer.
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Repair Difficulty
Medium
3/5
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