Ours pairs up by hitting a small button on the box under the seat in the caravan. We were told to place the handset close to the box and hold the button for a few seconds. Ours is a good few years old though.
There is always has developed a possibility the handset has developed a fault, ours did and we had to have a new one.
If you ring them at Truma they will talk you through a few checks, we found them very helpful.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets