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Danfloss heat exchange no pressure

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noheating

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Hi,

I have a Danfloss boiler/ heat exchange with underfloor heating. we have hot water but the heating isn't working. I can see that the pressure is at 0, but it's not clear how this should be repressurised. I had an engineer out a few weeks ago to fix the pump, which was showing an error code. No code is present now so I don't think it's the same thing. I've attached photos. any help gratefull received.
 

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