Came keypad/access control and viro v06 lock not functioning correctly

[bhgroom]

I have a viro v06 electric lock on my gate. It is controlled by a momentary switch on the gate alongside a came keypad/fob. It is fed a 12v supply from a transformer.

The lock operated when a current passes through a coil inside it which magnetises and causes the bolt to click open.

All was working fine until the old switch broke. I worked up a temporary replacement bit this wasn't a momentary switch like the original.

A guest left the switch on which I think burnt out the coil in the lock as it stopped working after this.

I have since replaced the coil in the lock and the switch to a new momentary and the lock now works, from all three inputs (keypad, fob and switch) but only now and again. It is not consistent.

When the lock used to unlock there was a loud buzzing sound. This no longer happens, it just clicks open quietly.

Any ideas as to why it is now only working half the time?

 

[333rocky333]

Is the power supply AC or DC and same with the lock, they need to be the same, i seem to recall the buzzing sound is a product of AC passing through the AC coil

 

[bhgroom]

They are both ac as far as I'm aware. Would it only function intermittently if the transformer was DC but the coil in the lock was ac?