Vaillant EcoTEC 837 Major Problem - Flooding

Can anyone help? When trying to pressurise my vailllant ecotec plus 837 boiler the condensate trap just constantly floods!! Is the unit buggered!?

 

Sounds like it,check the HX

 

Sounds like the main heat exchanger as said previously - call Vaillant for Instant cover (around £300) as the part is over £400 +vat

 

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