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Thanks you very much for your reply, it was the three port valve , i have to manually switch it to CH and my CH started working, Does this mean that the 'three port valve' is faulty and need changing, also as i manually switched it to CH , my CH started but the switch is back to Hot water is...
I have a Potterton Flamingo 20-30 boiler,it working fine with hot water but it fails to start the CH system,also when the hot water starts my downstairs radiators get warm.