Brötje Insufficient heating output / undersized or modulating incorrectly

Furnace runs but radiators stay lukewarm, long heat-up times, no 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

Incorrect heating curve setting, Stuck 3-way mixing valve, Partially blocked plate heat exchanger or primary heat exchanger, Pump running at too low speed

How to Fix / Troubleshooting

Safety: Turn off power before removing covers. System water can be hot; use caution.

  • 1. Check controller settings: On the Brötje control panel, review the heating curve and room temperature setpoint. Increase the curve slightly and test.
  • 2. Verify pump speed: If the circulation pump has adjustable speed, set it to a higher setting and observe radiator temperatures.
  • 3. Inspect mixing valve: For systems with a Brötje 3-way mixing valve, ensure the actuator moves when changing setpoint. If stuck, free or replace the valve/actuator.
  • 4. Clean heat exchanger: If the boiler is old or the system dirty, the primary or plate heat exchanger may be partially blocked. A technician should flush or chemically clean the exchanger.
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Repair Difficulty

Medium 3/5

Required Part

3-Way Mixing Valve Actuator
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