Message H72 on e learning thermostat. No led on Heat link is on or
blinking. 230VAC power supply to the unit is okay. Because of this we
have no heating, only boiler function is working now. I installed the
Nest thermostat in december 2019
Hi Alex. Thanks for your help. I did what you asked, but still the same
problem. The LEDs are off and there is no 12VDC power on the T1-T2
output for the thermostat. When I use the micro-USB port to power the
Heat Link the indication LED is on but st...
