Quote:
Originally Posted by retiredguy123
My float switch is also located outside of the air handler unit. But the only way to effectively test it is to block the drain line and to add water to the drain pan to see if the switch actually works and shuts down the system. If I were paying a company more than $100 per visit to inspect and maintain my system, I would expect the technician to do this periodically to verify that the float switch actually works.
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If your are careful, to test this switch, open it and you should see a ring or plunger. Move it up and your system should turn off. When you release it, your system will turn back on. Yes, as part of your maintenance the tech tests this overflow switch.