Please briefly explain why you feel this question should be reported.
Excellent videos on YouTube. Moreover, I encountered an issue where the temp of in my sitting room was scorching hot. From a prior issue two years back I knew I had to check my zone valve. When check I notice the lever on my first zone valve had no resistance. I had the same zone valve changed at least 2 years ago. My question to you is what causes this issue and is it a task I can manage on my own?