Vokera
Relay chatter / unstable control signal
Thermostat clicks or relay chatters rapidly when calling for heat
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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 minimum on/off time settings, Loose wiring causing intermittent contact, Faulty relay on receiver PCB, Control mode conflict between thermostat and boiler
How to Fix / Troubleshooting
Safety first: Isolate mains power before opening the receiver or touching wiring.
- Check control settings: In the thermostat menu, increase the minimum on/off time or enable TPI mode to prevent rapid cycling.
- Inspect wiring: Tighten all terminal screws in the receiver and boiler room stat terminals. Ensure no strands are loose or touching adjacent terminals.
- Listen to receiver: With power on, request heat and listen for rapid clicking. If present despite stable wiring and settings, the relay may be failing.
- Switch to OpenTherm (if available): If your boiler supports OpenTherm, consider using bus control instead of relay switching to reduce wear.
- Replace receiver: Persistent relay chatter usually requires receiver replacement.
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Repair Difficulty
Medium
3/5
Required Part
Vokera wireless receiver heating relay
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