Don't forget the problem in reverse. On my new variable speed HVAC system,
with a KW linear on CW - I would actually key the compressor. (Even though
the compressor timeout would disallow multi on/offs, the contactor relay
would still send good CW !) The culprit was the thermostat line
(4-conductor) where installing an RF filter (LC circuit) on each of the four
conductors in addition to some ferrites on the line easily solved the
problem. Next re-install I will put in a shielded multi-conductor
thermostat control line which was my baseline for the house LAN (shielded
ethernet line). Shielded cat XX (ethernet) line costs more but I think the
cost is worth it since my tower/beam is right next to the house Ken K5RG
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