ARTEX 4 beep error code

[Magman]

Artex 345 has been installed about 4 years with no issues. Now it is giving a 4 beep error code , which indicates low output power,bad load ( antenna or antenna lead) or a faulty ELT.
Anyone else has this issue and how did you diagnose?

 

[Bell206]

how did you diagnose?

There should be a T/S procedure in manual. Can you hear the 121.5 signal on a radio? Main check is to disconnect coax at ELT and put a 50 ohm dummy load. If it still gives 4 beeps then unit needs to go to shop. If it passes coax/antenna the problem.