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take it to a DAF service center or have a technician come out to inspect the fault
with limited engine rpms it is possibly in limp mode where the ECM restricts the engine speed and vehicle speed because it has registered a fault that is detrimental to the engine or transmission
LImp mode is only available to allow the vehicle to get to a safe place to stop so that the codes can be read and repairs effected
If it is an under body lay down engine then best advice is to run away as they have big problems with pulling liners into the sump or breaking crankshafts. ( local council bus service had over 100 units and every winter 25% would need engine replacement) Vertical motors will be a 190 engine or possibly a Scammel or AEC engine If it is a turbo charged 190 then be very careful as the first engines to be fitted with a turbo suffered from engine failure from split con rods and holes appearing in the block . This was later rectified by the use of a much smaller turbo unit that did not over boost the engine. Normally aspirated vertical engines from Leyland were reliable with regular service.. The major draw back was the economy and smoke (Is it a double decker London bus that you are looking at)
Blower motor resistor or heater fan resistor. It should be located in the plenum air flow to keep it relatively cool. Also check the wiring harness for any melted wires, or corroded connections on the resistor block. Any deformities in the plastic warrant replacement of that part of harness connector since I do not think your local vehicle inspection laws would allow it to be soldered to the harness.