Afternoon, can anyone give me some advice. I'm going to have a 2nd look at a fire alarm on monday which has detected a detector fault on one of the zones. I have reset the system but the alarm will resound about 20 seconds after reset. Am I right in saying that the detector that triggers the system will have a constant red led or flashes very fast? I'm told it was triggered from a flat which till now I haven't been able to access. what are any potential problems and can I over ride the system to test by shorting out cables in the detector. thanks