I have a MasterVolt Whisper (2800 I think) on board and I also had some issues with the exhaust
temperature sensor. If you are sure the temp is OK you can try to 'cheat' the sensor by cutting the cable some 5cm before the sensor and connect he 2 wires together before ordering a new sensor you will then have to reconnect. I did it as it was the advice I was given by their french support when at sea half way through the Atlantic. The sensor is known, at least on my version of the Generator
, to have some issues.
If you have a mail address I can send you a PDF version of my Generator
Alternatively, I would suggest you have a look at the MasterVolt web site in the Netherland download the User Manual of your Generator and leave a message. Usually the answer pretty fast.
I hop it helps.
Marc on S/Y Hanami II