Our upstairs towel radiator keeps filling with air at the top. We had a new system boiler, new tank and new pipework fitted in October. The new tank is in the garage which is underneath the house and the new boiler is in the kitchen at ground floor level. We also had underfloor heating installed in our kitchen, the manifold is in the garage under the house. The 3 towel radiators come on when either the hot water is on or the underfloor heating is on, but not when the other radiators are on. We keep needing to let air out of the upstairs towel radiator and top the boiler up with water at the same time. The pipes in the walls and under the floors are no longer easily accessible. Where is the air coming from and how do we fix it? Please help!
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