Air Conditioning - air handling unit wont shut off

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beginner144
06-13-07, 10:48 AM
when i turn the ac on, both the condensing unit and the handlling unit are running fine , but the handling won't automatically shut off. It runs all day. Yes and it's in auto mode. Any suggestion? thanks

JavaBob
06-13-07, 10:54 AM
Shorted wires thermostat base bad, stuck relay maybe..
beginner144
06-13-07, 11:02 AM
i changed a new thermostat not but help. what should i do next?

jim-connor
06-13-07, 11:57 AM
If the blower still runs when the wires are disconnected from the stat, then you likely have a bad blower relay. On newer systems, the relay is soldered to the circuit board. Hence, replacement of the board.

If, on the other hand, the blower shuts off when the stat is disconnected, you likely have a bad or miswired stat.
beginner144
06-13-07, 08:48 PM
thanks jimconner
When the air handling unit blowing, i disconnect all the wire from the stat but it still running. So it's gotta be the blower relay. I'm pretty sure all the wire run correctly when i changed the new stat. The blower got a thing look like a capacitor where all the wires run in. Is that the blower relay? My unit about 15-20 yrs old. You think the relay is soldered in the board ?