Delta Dore Relay Chatter Due to Unstable Control Signal

Thermostat or receiver emits a constant clicking noise as the relay switches rapidly.

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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

Loose control wiring, Incorrect voltage on control input, Faulty relay driver circuit, Severe electrical noise on supply

How to Fix / Troubleshooting

Safety first: Turn off power to the receiver and boiler before inspecting wiring.

  • Tighten terminals: Check all wiring at the Delta Dore receiver and thermostat base. Tighten any loose screws.
  • Check supply quality: If the receiver is powered from a circuit with heavy loads (motors, welders), consider moving it to a cleaner supply.
  • Observe behavior: After restoring power, test operation with a stable demand. If clicking persists, stop using the system to avoid damage.

Persistent relay chatter usually indicates a failing relay or driver circuit. The receiver should be replaced by a professional.

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Repair Difficulty

Medium 3/5

Required Part

Delta Dore RF Receiver Relay
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