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It was the board.

Replaced it earlier today and the unit has been running for 90 minutes already with no problems. (It is bringing the house from 61 to 70 so it will take awhile).

Thanks for...

It was the board.

Replaced it earlier today and the unit has been running for 90 minutes already with no problems. (It is bringing the house from 61 to 70 so it will take awhile).

Thanks for...

That seems to be the road I'm going down. I'll try the replacement switch to be sure, but if that doesn't do it I'll have to make the call.

If the switch and control board don't do it, it is time...

Here is my original thread:

http://hvac-talk.com/vbb/showthread.php?postid=709962#post709962

Since I had lots of new data I wanted to make sure the entire board saw this.

Basically I have a...

Thanks.

That what I figured.

A stuck realy seemed like the likely culprit.

I was talking about the terminals on the pressure switch.

Inducer motor reads ~120V. I didn't get an amp read yet.

I'm leaning towards the board (stuck relay). Everything else on the thing...

The thermostat does call for heat.

When it stops calling for heat the inducer keeps running.

Blower motor runs when it is supposed to (when burners are lit/for some time thereafter).

Inducer motor is getting 120V from the control board.

The pressure switch is closed (meaning current...

Any ideas? (Trane XE90, Model TUC080C942A0, Manu 1994)

Pressure switch works, meaning it is open when the induction fan blows and is closed when it is not. With heat on each terminal reads ~26...