Vokera Short Cycling / Intermittent Operation

Boiler randomly turns off and on, or cuts out before reaching the set temperature.

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.

Possible Causes

Oversized boiler for the system, Blocked or closed radiators, Incorrect pump speed, Faulty temperature sensor, or PCB hysteresis.

Safety first: No immediate hazard, but efficiency and comfort are affected.

Open radiators: Ensure enough radiators are open to dissipate the boiler's output.
Check thermostat location: Avoid placing the room thermostat near heat sources or in direct sunlight.
Engineer tasks:
- Adjust pump speed and check the 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 optimized by an engineer.

Medium 3/5