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The battery has failed in my alarm, a motorbike style battery, will changing it mean that the code is lost from the system if it's switched off for replacement? or is there some type of c-mos backup, and how long will that last when the system if off? Normally the battery prevented the alarm...

Hi, Have the above, and recently it started tripping, that required the reset switch to be presses to restart it, but since has started not producing hot water or lukewarm radiators...and the pressure reading on the boiler itself fluctuates..I understand that thermistors have been mentioned? as...