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I have an old clockwork Sangamo central heating programmer fitted at the moment and wish to upgrade to a more modern electronic LCD type. Are there any preferences for which type I should go for? The central heating system is gravity fed with the choice of either hot water only or hot water and...

Anybody help? When my room reaches its required temperature and the thermostat switches off there is a very loud bang from the system. All rads have been bled and are getting hot and the pump is set to its slowest speed.