[Solved] Kaisai Air-Water Heat Pump Error: Low Water Flow Issue with Buffer and Underfloor Heating

Good morning, I have a Kaisai air-water heat pump, installation with a buffer and underfloor heating, every now and then I get an error for low water flow and the pump turns off, which may be the reason. Regards

Probably too little flow.
Have you checked the filters? Maybe an airlocked system?
How do you have the buffer connected? As a coupling or in series?
Do you have floor shorts? Radiators? Any controls? Valves?
With so little information about your installation, we can only guess.

I had an eco-pea coal boiler, I replaced it with a PC, power supply for the buffer and DHW from the heat pump, further from the buffer, output to the installation of floor heating on the ground floor - upstairs, 2 pumps behind the buffer on the ground floor and upstairs, three-way valves for floor heating, the installation was left after the boiler, 2 ladders in the bathrooms are powered from the buffer, return from the buffer and HUW connected to the heat pump

Added after 3 [minutes]:

I installed the buffer so that the pump sees the buffer and has the right amount of water to prevent frosting, not what is behind the buffer, I just wanted not to modify the already existing installation.

Added after 1 [hours] 19 [minutes]:

I'm sending photos

Buffer connection

Hello, the mesh filter in front of the pump was clogged, as I cleaned it, everything is ok for now.