Much less exhaust steam - Carrier 58MTA 80,000 BTU

Kube1989 · January 29

Noticed suddenly far less steam out the exhaust. Cleaned Blower, new capacitor, new limit switch on burner box…no improvement. I opened up inducer assembly and cleaned flat disc impeller & all vacuum ports and lines. Pressure switches operating as should.

Tried new control board- same results. I snaked both the intake and exhaust- no clogs.

When it was running, I "helped" the intake with aiming shopvac (on the blowing side) at the intake and steam started rolling.

Is it possible bad windings on inducer motor that is enough to close pressure switches but not enough RPM to vent properly? OR… is it more likely a bad secondary heat exchanger? I tried the long match in the primary with blower running and there was no dancing flame.

Just need the best suggestion (if I can avoid buying a new furnace). Thanks!!!

mattmia2 · January 29

is it a modulating furnace or just single or 2 stage?

what do you get when you clock the meter?

Kube1989 · January 29

It's a 2-stage

I have not clocked the meter- and you might have to explain that… :-)

Thanks!

mattmia2 · January 29

look at @Tim McElwain 's response in this thread:

https://forum.heatinghelp.com/discussion/163822/clocking-a-natural-gas-meter

EBEBRATT-Ed · January 30

You need to define what problem you are having b4 shooting the parts cannon that will not fix anything.

You seeing less steam in the exhaust? is that you problem? How is it heating?

Kube1989 · January 31

Struggling to keep house above 62…slightly funny smell. When I had plenty of steam- house was warm.

Less steam- house cold. no real budget to do a new full replacement- not many parts left to replace

Taking hours to raise he house temp 8 degrees.

mattmia2 · January 31

is it firing at the proper rate?

Much less exhaust steam - Carrier 58MTA 80,000 BTU

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