Hi guys

I recently moved into a new house in CHCH and it has a timer wired in to the night store heater. Im having trouble working it correctly, its hard to figure out because its a night store heater its hard to tell when its on and when its off, I was hoping some one on here has a similar setup and can let me know whats on and what off :). Picture of the switch http://img834.imageshack.us/i/dscf1252v.jpg/ 

Thanks