I have just bought a HSA6080 remote keypad for my HSA6400 wireless alarm. I have successfully added it as a device; I know this because (a) it is recognised when I do a walk test, (b) I can arm the system by pressing the red padlock picture aka the arm button, and the exit time countdown begins as expected. However I can't disarm the system by pressing the green padlock disarm key followed by my 4 digit normal access code. The manual doesn't seem to be completely clear, and I basically need idiot-proof instructions. Tried calling Yale helpline twice, on hold twice for 20 mins + before hanging up, as they were experiencing an unusually high volume of calls, but of course my call was important to them! Any ideas? Thanks