Hi we have this fridge freezer in our 2019 Burstner we are away for three months in France. On the way down noticed that the fridge would not switch to 12 volt when engine is running, but would auto switch between gas and 240. I assumed that it had lost the D+ signal. Now today it will not light on gas, have been on mains for four days but prior to that it was fine on gas. There appears to be no voltage at the solenoid valve, so although sparking it will not light. I am now wondering if the control board is on the way out given two faults. There are three wires to the control valve red to the top black to the bottom and a yellow wire to the body of the valve. Any suggestions please?