id say your fault will be around he bellbox. You mentioned no leds?

Id check there first

Sounds like good advice, I didnt realise the keypad also had a tamper device, I will check, clean contacts and also check between the 2 contacts for the 24hr tamper on the circuit board, do I expect high or low resistance?

And for the chap from North of Watford, thanks for the link to thr engine stuff, yes standing next to a fast jet engine in reheat is just slightly more concerning than disturbing the neighbours with my alarm bell test today, hurray for

Sir Frank Whittle of Great Britain patented a design for a jet aircraft engine in 1930.He first proposed using the gas turbine engine for propulsion in 1928 while a student at the Royal Air Force College in Cramwell, England. In 1941 an engine designed by Whittle was the first successful turbojet airplane flown in Great Britain

And yes I will try and keep to the subject

Simon

If you remove the two wires from the tamper connections in the panel (can't remeber how they are labelled) the circuit should be very low resistance, the actual value will depend on length of cable runs but it will be below 20 ohms in an average domestic installation.

As somebody else has mentioned the lack of LEDs on the sounder could be a clue, check the bell fuse in the panel and make sure you have 12 volts between the sounder + and the - tamper return. Again I can't remeber how these are labelled with this panel but post again if you get stuck and I'll dig a manual out.