I have recently installed & tested the HSA 6400.Unfortunately i removed the Control Panel from the backplate to position trunking for the telephone cable.On refitting the Control Panel to backplate the display indicated 'Panel Tamper' ( not surprising) & showed a permanent yellow fault light.I have gone thro' the clear fault log procedure without success.I have also ensured that the Control Panel sits snugly on the backplate.( currently 'off the wall').I can activate the alarm via the 'Force Arm' procedure & the yellow light goes out, but returns after deactivation.Could someone please advise how to return to normal function.Thanks.