E04
Brötje Water pressure below minimum threshold

E04 displayed, low water pressure lockout

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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

System leak, Insufficient filling, Faulty pressure switch or sensor

How to Fix / Troubleshooting

See also A04. The procedure is similar:

  • Check and top up system pressure via the filling loop.
  • Bleed radiators and recheck pressure.
  • Inspect for leaks and repair.
  • Replace the pressure sensor or switch if the reading is incorrect.
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Repair Difficulty

Medium 3/5

Required Part

Water Pressure Switch
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