High Flow/Return diff

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Al-pax
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High Flow/Return diff

Post by Al-pax »

Hi, I've just drained the central heating and taken off a radiator. I've then refilled and re pressurised. I've bled all the radiators and boiler pressure at 1.2 bar.

When I use the hot water the boiler says

'High Flow/Return diff' and there's a pumping sound coming from the boiler....

Can anyone help?
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gas4you
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High Flow/Return diff

Post by gas4you »

Could be an air lock in the boiler.

Whats the make and model of boiler?
Dave
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