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Hi My downstairs rads are ice cold and at the same time the upstairs ones are all heating fine. what could be the cause. please help.

Hi everyone , i have a ravenheat csi 85 which is giving me trouble, i have had no heating for two days , changed the batteries on rf1 got it to shake hands eveything is responding well the green and red light when i raise the temp, but the boiler will not fire up for C H .the hot taps are...