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Please can anyone advise. My house was built in 1983 The central heating pump fitted during construction was a SMC Commodore 2. The model number was 2-130-60 type Cast Iron pump case length 130mm. At some time later due to a problem British Gas changed the motor head to a Multi-Head 11. I am...

Please note my central heating and hot water is working ok at this moment. I am considering changing my central heating controller from a Honeywell ST699 to a Honeywell ST900C. I have checked all the wiring against the Sundial Y-Plan wiring Diagram of the ST699. Everything is correct except...