Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Water Thermo Switch

1. Remove water thermo switch.
2. Place switch in container of water and connect circuit tester to terminals of switch, then slowly heat water while observing temperature.
3. Tester should show continuity when water temperature is above 59° - 67° F.