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Hi ReJect, thanks for the reply and list of suggestions. I did think it could be the pump. However, looks like it could be any number of issues. Not a DIY task for me. Will call in a plumber. Thanks for the advice.

We have underfloor heating on the ground floor of our house (wet underfloor heating system). The upstairs is radiators. Both work off the boiler. We are finding that when the thermastats downstairs and upstairs are both set to heat the whole house, only the ground floor underfloor heating gets...