If you are sending a startup command via telestart, without the engine running, and all you hear is humming, then the primary cause could be the air fan. If the air fan fails to start, the FBH will do nothing at all and appear dead.
You are correct about the fuel not reaching the unit, that is because.....
The FBH dose pump will only be initiated after each primary component has past an electronic test, then, basically.
The air fan purges the combustion chamber.
The water pump is started.
The glow plug is lit.
The dose pump primes the combustion cap at idle rate.
The air fan starts to ramp up to full load, the dose pump steps up to full load speed, the glow plug is extinguished which takes on the role of flame sensor.
If the FBH senses fuel ignition, it continues to ramp up to full load. If the flame sensor does not detect fuel ignition, the dose pump is stopped, the FBH goes into shut down, and the air fan purges the combustion chamber.
Your problem could more than likely be your PCB.
you have a PM
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