Thanks Tony,
The second posting was a mistake. The Truma has been fitted in my boat, a 33’ 1974 Princess cruising the inland waterways of Ireland, since I bought it over 20 years ago. I think the pcb has failed. I need a gas-fired unit as many berths up and down Ireland do not have mains. Truma (and Propex) have stated that their units are not approved for Marine use, and whilst they would do the job, if any was to go wrong then the guarantee would be null and void.
I appreciate all the responses I’ve had on my first posting on the forum.
Rodney