Question 1: The water is not hot
Phenomenon: not working/switch not turned on/excessive flow exceeds heat exchange capacity (water flow can be reduced to achieve comfortable temperature).
Question 2: Unable to start
Phenomenon: In extremely cold weather, there is no response after the start-up click sound (usually the oil circuit is blocked, and the fuel supply is not smooth after the diesel oil is waxed).
Method 1: Add high-label diesel such as -10#, -35#, etc.
Method 2: Heat or clean the oil pipeline to keep the oil pipeline unobstructed.
If it still can't be solved, please ask a professional for maintenance.