Use M12 or M14 size screws.
Hongli Tianyang is a professional manufacturer of solar water heaters, wall-mounted boilers and other products. The screw size of its solar liquid filling port is generally M12 or M14.
After confirming the matching of the screws and the liquid filling port, it is necessary to maintain appropriate tightening force to avoid problems such as over-tightening or loosening of the screws.
If it does not light up, it is usually an instrument fault. The built-in battery may be dead or the transformer capacitor may be damaged!
For more products and information, please visit Baidu's "Jiangyue Mall", the most comprehensive range of machinery, accessories, etc. solar energy.
Recommended: ""Dr Sun" Solar energy (class 1 energy efficiency, 3C certification), Sanca solar energyng (no need for water level sensor probes and solenoid valves), the heating and hot water utilization rates are fast in rainy days, and the after-sales rate is also greatly reduced, saving both time and energy. Ordinary single storage solar heating only takes 20-30 minutes without sunlight, while single storage heating takes 2-3 hours!