Have you reviewed this troubleshooting guide from the manufacture? From replacement boilers to complete central heating installations we offer free quotations and will beat any written quote! Ok, not strictly aibu, but i am in a bit of a quandary as to which way to go to replace old gas boiler that went phutt at the weekend. Let us know how we did click here to leave a google review. Thank you so much for all your help with my medicine.