Although not necessarily the main reason for the lack of effectiveness of the cooling circuit, it is worth noting that the main circuit was still in a "safe config" with the valves at the end of the main loop fully open so that the whole flux could in principle take this way instead of going through the appliances to be cooled down.

This morning the valves at the end of the main loop were almost completely closed, so that the effectiveness of the cooling should be at its maximum now.