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In this video I show you what the cause could be if underfloor heating is not working or is not circulating. Often the problem is that there is air in the system or the pump is defective. But it could also be that one or more valves are stuck. Even though the actuators are open, the valve below may not open. It could also be that a flow meter is defective. I replaced everything. But you could also just replace the one that is defective. The flow meters can also be cleaned instead of replaced. The whole job takes about 1.5 hours and requires few tools. Afterwards everything worked smoothly and the underfloor heating was warm after a few hours. If you have any more questions, please write to me in the comments. Fittings pliers✅️* https://amzn.to/4aACfqE Pump pliers✅️* https://amzn.to/41EfA8T Flow meter✅️* https://amzn.to/47h2oYO Actuator underfloor heating✅️* https://amzn.to/48c81sA The references marked with an asterisk (*) are so-called commission links. If you click on such a link and purchase via this link, I get a commission from your purchase. The price does not change for you. All recommendations are based on my own experience.