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Thanks for your comments so far...... Update. The pump is working fine. I have turned off all upstairs rads and turned off water heating and turned up temp, and turned off all but the furthest rad from boiler. This comes through hot. I then do the same with all downstairt rads to see...

Posted by an Ex-Royal Marine and used to warmer weather!!!! Over the past week, the radiators down stairs are cold,(started last weekend in fact). Previuosly all ok. Gravity system. Boiler and pump downstairs. Symptoms....... All upstairs rads are hot. Two downstairs rads are hot The...