Ok engineer came having spoken to both oftec and the manufacturer.
We had a long chat and although they suggested moving the tiger loop from below the boiler to above or next to the pump, He thinks as you do John, that the motor is bedding in with the pump.
He has had to slacken off the bolts on the pump to allow it to find its right setting and the spindle in the pump to settle in then he will come and tighten the bolts over time once pump is settled.
He said the fan is working fine.
He also pointed out that if the built in no return valve on the tiger loop was at fault there would be no oil in the tiger loop and that has always remained at a constant level with no signs of bubbles etc.
So for now we will see how it goes.
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