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Thanks for your reply. Its good to know that its fixable. Hopefully, I can find someone with the right know how. Steve.

Can anyone help? I have a fully pumped system using 2 honeywell V4043H valves. Valves, timer, pump and tanks upstairs. Boiler and thermostat downstairs. Central heating and hot water can work together or independently. My potterton netaheat electronic 10-16 boiler gives no heat. There is...