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Energy bills have been increasing. There are still ways to reduce this.

Vaillant VR33 Module Installation


  1. Turn of power to the boiler
  2. Install the VR33 Module on the left hand side as shown

Your PCB may vary depending on the model.

3. Connect VR33 X32 to PCB X31. Please note sometimes the correct connector may vary, see the installation manual to determine latest connector.

4. Link the 24v connection on the PCB with link wire as originally before external controls were in place.

5. Connect your OpenTherm thermostat to the OpenTherm connector on the VR33 Module.

6.Turn on power to the boiler

Green lights on VR33 Module will flash. To confirm the correct connection you may go to the settings menu and check D.90 for confirmation of recognition of the Ebus VR33 Module.

Other Resources

Remove VR33 Module

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