Heat Siphon DIAGNOSTIC VIDEO - Will not start

What to look for if your Heat Siphon won't start - this video applies to all ANALOG units made before January 2010 however much of the subject matter and tips are applicable to ALL Heat Siphon models made right up to today - especially the first few minutes

[@lm128]

Haven't even finished the video or tried to diagnose my problem, but wanted to thank you for taking the time to create such a great video. Thank you so much.

[@soniamicek7360]

Your video is very helpful. The pace allows the listener to understand and process. Thank you!!!

[@davesekulski5219]

You helped me figure out my heater with this video. Thanks!

[@cesarrico3270]

Thank you so much for your great video followed everything like you said and found the problem it was the five minute delay switch thank you so much! :-) very well-made video!

[@lm128]

I found my problem and was able to correct. Time delay switch. Thank you!

[@stupickles1]

My heater will work in morning and will shut off. Once this happens it will not come on. I followed your voltage check and it appears to be the 5min timer delay. I get 24v on lower side but 0 on exit of it. I just ordered one and we will see if this is it.

[@mbas0507]

Hi, i have two problems with heat siphon units
1.- one system is runing for hours and can not reach more than 87 f, is a 40 sq/m pool using a z575 unit, pool is completely indoor, outside temp average is 15 degrees centigrades, 10 by night 18 to 20 by day, what do i have to do ?
2.- problem is with a similar pool size and another z575 unit, thsi unit does not even start, and we can tell that when the unit try to start, voltage on input drop ( half second ) to 177 volts. so, is that the problem ?, what should i do to fix that.. regards Alex