Weishaupt Intermittent Operation / Soft Lockout

Boiler starts but shuts down after a short time without showing an error code.

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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

Over-sensitive temperature control, Poor circulation causing rapid temperature rise, Faulty sensor with intermittent connection, Control board intermittent fault

How to Fix / Troubleshooting

Safety first: Observe the boiler carefully during operation; do not remove covers while live unless qualified.

  • Monitor temperatures: Use the display diagnostics to watch flow and return temperatures. Rapid spikes indicate flow issues.
  • Check pump and valves: Ensure the pump runs continuously during demand and that all relevant valves are open.
  • Wiggle test wiring: With power off, gently move sensor cables and connectors to detect loose contacts. Reseat or replace as needed.

When to call a professional: Intermittent control faults can be complex; a technician may need to monitor the boiler with diagnostic tools.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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