Electricians / HVAC experts question

[TheGman]

The heat went out yesterday (fancy WiFi thermostat went dark). Suddenly just out. We called HVAC folks (new system installed last year). They said its the controller / Trane XL 1050). Came back today picked up old one brought back a new one,

Installed this afternoon it was flickering. Checked several things.

Went into attic where unit is and found this.

Electrical disconnect.

They replaced it. What causes this?

 

[DanKATL]

The heat went out yesterday (fancy WiFi thermostat went dark). Suddenly just out. We called HVAC folks (new system installed last year). They said its the controller / Trane XL 1050). Came back today picked up old one brought back a new one,

Installed this afternoon it was flickering. Checked several things.

Went into attic where unit is and found this.

Electrical disconnect.

They replaced it. What causes this?

View attachment 3116981 View attachment 3116982 View attachment 3116983

Did you have any lightning with the recent storms? Any power blips?

 

[rumrunner55]

Whoaaa

 

[The Southern Gentlemen]

You sir are one lucky man!!! Thank god your house didn’t burn down

 

[TheGman]

Last first , yes sir I agree.

yes , whoa!

none that I recall lately certainly not yesterday I don’t recall hearing my thunder in weeks.

all was working as normal until mid morning yesterday

 

[zamoramax]

Ok so I'm questioning what I see.. I see in the first pic the white wire landing on the lug or so it seems. Then the wire splits. I would assume that was done by someone manipulating the wire. The second photo shows the lug on the split end. How was the wire terminated? Limp wristed guys can create these problems as well. The full picture of the disconnect would be preferred.

Sent from my SM-N960U using Tapatalk

 

[TheGman]

 

[THREEJAYS]

Not sure, but you definitely dodged a mess

 

[TheGman]

@Darkdiesel any idea?

 

[woodstock]

Likely loose connection at the electrical disconnect lugs where the wiring lands. Did they use aluminum wire? If so that takes even more care than copper. Essentially if the lugs that attach the wire at the disconnect are loose, its a matter of time before they overheat. I wonder why the breaker upstream (that feed it from the main panel) did not trip. You should have it tested or simply replace it as well.