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If their was a blockage surly the heating would not work on test mode? Tom

Sorry Pump was on its way out had a plumber round who said the pump was no good so I changed it. It then worked fine for a few days. A few days later went back to operating as before rads luke warm although, hot water is fine. one more thing when you first put on it fires up fine the...

Hello I have a 28cdi the problem I have is that it does not get the rads hot just warm I have changed the pump. Also when I put it in test mode all the rads are hotter than the surface of the sun. any ideas tom