I have just changed my central heating pump from a Wilo gold 50 to a Lowara ecocirc 25-6/130 as the wilo broke. The pump is working and taking hot water some of the upstairs radiators but none of the down stairs. Do I have an airlock in the system? I have done the air purge 3 or 4 times on the pump. Any help would be great as the wife is complaining it freezing! cheers
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