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So a replacement value head should sort the issue?

Thanks for the reply, Even though it works fine when the downstairs heating is on?

Good evening people, having a very frustrating couple of days!! The problem is as follows. If i put the Downstairs thermostat on override. Operating light on mpe222 valve. Boiler fires up. Heating supplied to downstairs. Then override on upstairs thermostat, this puts on operating light and...