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honeywell st9100c

  1. K

    Honeywell ST9100c heating towel rails randomly

    Hi, We have a Honeywell St9100C timer fitted which controls the towel rail element of our heating system so there is no thermostat. However despite repeated attempts to program it, the towel rails are just on whenever they fancy it! The Honeywell is fitted through our underfloor heating...
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