Hello, this is due to many reasons: blocked water supply, solenoid valve failure, water level probe (check if the water level display on the meter is normal depending on use, if normal, the probe is not defective), and finally the meter may be defective! It is recommended to ask the buyer to solve it!
Recommended "Dr. Sun" solar energy, three warehouse models (no need for water level probes and solenoid valves), heating and hot water utilization rates are fast in rainy weather, and the after-sales service rate is also greatly reduced, saving time. It also saves electricity. This model only takes 20-30 minutes to heat without sunlight, while the single-chamber thermal fluid takes the same time.
What a blue! one is called solar thermal fluid or solar antifreeze, everyone who sell solar energy l'ont.
The blue medium is the same as the light green
No matter the region, the medium is just used to heat and not to evaporate, this does not is not wintery, the acidity is low, it does not corrode the inner tank, the medium must be filled, if you are not satisfied, it will not circulate
The answer stops here, no one will answer if you ask again, you are such a boring question