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On CH demand, boiler fires up, pump runs, gradually heats up, reaches max temp (80 deg led) in about 30 seconds, flame extinguishes and pump continues to run until temp decreases to 30 deg led before the boiler fires up again? Result is that the rads get hot but not too hot to touch. Problem...

ch is fine. Needle on differential valve does not move when hot water flows - no matter what flow rate. Checked diaphragm - looked ok but replaced anyway. Needle moves ok and doesnt seem to stick. Checked the two sensing pipes - clear. When microswitch triggered manually then divertor...