Question
I have a Hardie controller and it suddenly shows a short.  It says that I have a short on every programmed station.  This is not possible as I have no central valve.  Just 8 stations on a 18 station clock.  How do I find the short?  Thank you for helping.  

Answer
Hi Peter

Usually the shorts are at the selenoids. Disconnect each selenoid from the two wires and use an multimeter to measure the ohms (set it at 200 ohms), if is god it should be between 20 - 60 ohms. Below 20 ohms it is in short, over 60 ohms it is open, if the selenoid is out of range (20-60ohms) replace it.

Regards
Guillermo