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  1. R

    Sparks from Heating Controls Spur Box. Help Appreciated.

    I noticed that my CH HW programmer unit (Honeywell ST9400C) was not showing that it had any power to it. When I checked the spur box for the heating system it had the red neon light illuminated ok but there was definitely no life at the programmer unit. I switched the power off at the spur and...
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