Tony firstly you need to check that you are getting 230volts to the control pcb. it is posible on an Arizona by removing both draws above the heater and sticking your head in to get to the pcb in the grey plastic enclosure.If you have got 230v on the input terminals then more than likely the small 230 to 12v transformer on the board has gone. Do not pay anyone £165 for this. Ring Gary at ARC systems I think he has replacement PCB in stock, It is his living So i would recommend him. Failing that give me a PM or call on 07774142892
Sounds like a dry soldered joint on the heater control pcb 230 to 12volt transformer, at the back of the heater in a grey box. ASk Gary @ ARC systems he stock these. However if you are not fully competent with mains electrics , it would be better to get someone who is to have a look.
Firstly if you have got a green light on the control that means you have 230volts to the PCB at the rear of the fire (in a grey box)there is a 230 -12v transformer on this pcb which provides control voltage for the 3 relays on the pcb these relays are configured to give the 2 1000watt elements to work in parallel or series. Can you hear these relays clicking when you select 500,1000 ,2000 watts? These Relay do fail on the earlier Pcbs i.e. Coils work but the contacts burn out. Gary will fix you up with a new PCB if this is the fault.