What is a controller relay and why is it beeping

Forum: 

Hi all,

New hijet can user and forum member.

My hijet just went through an MOT but it is making a beeping noise.

Ive identified the part as controller relay 11475-1117.

Does anyone know what this is and why it would be beeping?

The van used to have lpg and it intermittently has the engine light on.

Thanks again

Richard