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heating programmer

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    How to connect Honeywell to replace Horstmann programmer (Ed.)

    Hi all - bit of issue on Christmas Eve My Horstmann channel plus model H27 has stopped working. I have been able to source a Holywell ST9400A this morning. The Horstmann has following cables connected in Clip position 5 black cable Clip position 4 cable black cable Clip position 2 cable 2...
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