Best thing it to access it and pull the 2 pin plug. You may think you don't want to use it but the fact is the FBH is used it every time you start your engine when the temp is 6 or below as a auxiliary heater. The alternator sends a start up signal to the FBH each time you start the engine. If the FBH is receiving a signal from the temp sensor telling the FBH the ambient temp is 6 or below, then the signal from the Alternator will initiate FBH start up. It runs until up to temp, then goes into standby until engine cools down, or the engine is turned off.
You remote control is for use as a parking heater (or pre heater), when the engine is not running. I repair the Webasto FBH, and unless the parking heater remote control has been modified to switch off the signal from either the temp sensor, or the alternator (a mod I did to mine and SWMBOs), because they are frequently just moved on/off the drive, or used for less than 5 mins, making FBH start up pointless when above freezing.
Although emitting smoke the FBH is still working, bit like a BBQ, except the carbon build up does not get hot enough to turn to ash.
You will notice a big difference when you disable the FBH.
The parking heater function is controlled by the user, the auxiliary heater function is controlled is by the vehicle, unless the auxiliary heater function has been disabled or modified for user control.
Standard parking heater installation control will not give remote control of the auxiliary heater function that I have come across, but I tend to steer clear of factory controllers, too expensive.
Been a while since I did RR install, cannot remember the fuse no, but pretty sure it is engine bay 20A.
I have cured smoke emission on numerous occasions with the FBH in situ, the line between smoke and no smoke can be pretty thin. with the FBH warmed up and running, I put my compressor hose in the air intake, this has blown carbon out the exhaust. I have also fed the FBH paraffin instead of diesel, ( using a standalone dose pump and 6 pin adapter harness, so the FBH sends the pulse to the standalone dose pump, instead of the vehicle dose pump, the dose pump is controlled by the FBH, not the vehicle electrics, and used the air hose as well.