A13
De Dietrich Circulation Pump Fault

Boiler displays A13, no heating, pump symbol may flash

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

Seized circulation pump on De Dietrich hydraulic group, Air lock in pump, Electrical failure of pump motor, Blocked pump impeller due to sludge

How to Fix / Troubleshooting

Safety: Isolate power and allow the system to cool. Have towels ready for possible water spillage.

Steps:

  • Check for pump noise: On a heat demand, place a hand on the pump body. You should feel vibration. If silent, it may be seized or not powered.
  • Free the pump shaft: Many pumps have a central screw on the front. With power off, remove the screw (some water may escape) and insert a screwdriver to turn the shaft. If stuck, gently work it free.
  • Bleed air: With the screw still loose, allow air to escape until water flows steadily, then retighten.
  • Reset boiler: Restore power and reset. Check if the pump now runs.

Professional help: If the pump does not start or trips the fuse, it likely needs replacement. A technician should also check for system sludge and consider flushing.

Advertisements

Repair Difficulty

Medium 3/5

Required Part

Circulation Pump
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements