Comfort Automation/ Security System Forums

I have two DM02 boards in my ComfortII system.  They have worked fine for many years.  Recently I have had some strange behaviour on one of the DM02 boards.  
I wanted to see if there is a way to test that it is functioning properly or do I need to replace it.  
When I press the SW2 switch on the board it is very slow to respond.  Sometimes if fails to ring the telephone.  Before replacing it, I just want to make sure that the board is in fact bad.

Exchange the IDs of the 2 DM02s, and see if the fault remains with the same DM02. If it does it is probably faulty

I have several \'spare\' DM02 boards if you need them just e-mail me direct.