I have a Switchmaster 9001 boiler controller which loses all settings when the mains power is interrupted. The backup battery is a rather large button style measuring approx 22mm in diameter x 12mm deep and is very easy to replace. However I cannot find out the battery specification and thus am unable to source a replacement. Is anyone able to help?
Hi, unless there is a number on the battery you may have to change for a modern programmer as the size you quote is not near any in my catalogues, sorry
Sparx
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