Main Forums > The Roundtable
HVAC /heat pump not cycling
Leatherneck:
Harold, remember the mantra of the docs: "First, do no harm." Overriding automatic controls longer than a second or two to diagnose a system can burn out components that will run up the bill. Try a different company maybe?
TC
Harold Tuttle:
well the way this switch works
when it receives 24 volts it clamps the contact shut and starts the cycle
when the thermostat sees the proper temp it drops the voltage and the contacts open
i'm gonna jumper the contacts and bring the system online while i figure out
why the 24 volts is not being sent
Harold Tuttle:
and thus the cool air did again floweth forth from the ductwork
280plus:
In the T'stat jump R to Y. I believe you'll also need to jump O to R to cycle the reversing valve for cool mode. That should call in the contactor in the outside unit. If it doesn't look for a signal across the contactor coil terminals. If you got 24V and the contactor is not pulling in it is bad, If not, something else is wrong.
I like how you called it a switch. Thats the hardest concept for people to get. A contactor or relay is nothing more than a remotely operated switch. Harold gets an "A"!
280plus:
What'd ya do?
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