Buderus Hydraulic Imbalance / Local Flow Restriction

Boiler shuts down when a particular zone or underfloor circuit operates

Advertisements

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.

Advertisements

Possible Causes

Undersized or stuck zone valve, Incorrectly set mixing valve, Air lock in specific circuit, Blocked manifold filter

How to Fix / Troubleshooting

Safety: Allow circuits to cool before working on valves or manifolds.

  • 1. Isolate problem zone: Identify which zone causes shutdown and close its valve to confirm the relationship.
  • 2. Check zone valve: Inspect the motorized valve or manifold actuator for correct operation; replace if stuck or not opening fully.
  • 3. Bleed circuit: Bleed air from the affected zone or underfloor manifold.
  • 4. Clean filters: Clean any strainers or filters on the problematic circuit.
  • 5. Adjust mixing valve: Ensure any mixing valve is correctly set and not overly restricting flow.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Zone Valve / Underfloor Manifold
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements