Interruption of the liquid cooling circuit.

Check if the loop of the liquid cooling circuit is closed.

The liquid cooling circuit of the Light Processor Unit is mistakenly excluded from the main liquid cooling circuit.

Reconnect the cooling circuit of the Light Processor Unit with the pump and heat exchanger.

The pump of the water cooling is electrical disconnected.

Check if the wire unit (reference 1 & 2 image) of the pump is properly connected. To check if the wire unit is properly connected the cooling assembly has to be a few cm pulled out of the projector chassis.

Blocked dust filter of the heat exchanger (bottom side).

Clean or replace the dust filter.

No or insufficient liquid inside the cooling circuit. The pump is sucking air and sounds noisier then normal.

Start the top up procedure to fill the cooling circuit with liquid. See "Liquid Cooling Circuit".

Malfunction pump of the cooling circuit. You don't feel any vibrations when touching the pump after activating the “Refill mode” via the Communicator software.

1. Check the electrical resistance of the pump winding. Replace the pump if infinite. See "Replacement of the Pump".

2. Drain the liquid cooling circuit, open the pump and check if the pump rotor is not blocked. If so, remove the rotor and clean the bearings of the pump. See "Liquid Cooling Circuit".