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A firmware (software which controls the cross trainer) would not fix this fault.
You can check if your frimware is current by calling the service line on +31 36 546 00 50
It suggests the PCB on the appliance has developed a fault, they dont seem to have any service centres (just resellers) in the UK, as such this would suggest the fault you have is uneconomical to repair.
However before writing it off, if you provide me with the serial number and date of purchase I can contact them for you and see if they can swap it out with a reconditioned unit.
It could be a data cable fault, have you checked the plug at the back of the console, the cable should just be a normal network cable (RJ45 plug at each end), so if tis the cable you can pick one up from any computer store.
The sensor is about £25, I have located a UK stockist called Benchmark, their number is ***** 870 363
Let me know if you need any further assistance.