Carrier 58MCA long igniter warm-up time

davetab

I've been outside the house and noticed water being belched out of PVC on the side of the house....

HVACTECH96

If you want to remove trap you have to take bottom panel off, two screws usually, then you will see bottom part off trap.Should have a rubber hose that drains to outside off furnace.Loosen clamp andpull hose off.Then remove three hoses on top side, the big one will have water pouring out.Then squeeze two tabs on top side and swing trap to the left and out.Flush with lots of hot water till no more garbage comes out.I usually fill and shake it over and over till water comes out clean.

HVACTECH96

Water vapor dripping from exhaust is normal.

davetab

OK, cleaned that condensate as recc'd. It wasn't terribly dirty...ran clean very quickly. And, the larger tube that you said would gush water....dripped just a little. Don't know if that's significant. I did "blow" all of the tubes to clear them while I had them off.
What should I try next?

HVACTECH96

Was furnace off awhile? if so thats why no water coming out.Turn on and see what happens.

HVACTECH96

Also check exhaust piping from furnace to exit of house to make sure no broken hangers or dips in pipe.

davetab

There is pvc going out the roof of the house (3 story/slant roof) and the side of the house (where I mentioned I've seen water belching). The roof will be a challenge for sure...I can check the side of the house. Can this be done from inside?

HVACTECH96

Does one or two pipes go out the side of house from furnace?

davetab

One coming out from side of house

davetab

Still code 31
I took off the cover to the combustion chamber - here is what happens.
I works and works, then the flame sensor flares up, blue flame shoots, and it blows warm air. Then the blue flames go out, it continues to blow air for a short time, then stops. It starts over...work, work, flame sensor, blue flame, hot air, blue flame goes out, it blows hot air for a short time then stops.
Eventually, the flame sensor flares up, blue flame shoots and stays shooting until the thermo shuts it off.
Is this helpful?

HVACTECH96

That should be exhaust, just make sure pipe looks ok where it is visible inside the house.No need to check roof.

davetab

If you were a betting man, would you put money on the gas pressure switch?

davetab

Here is what another guy did on this unit to fix this problem - what and where is the upper air intake pipe? Is it PVC?


Thanks for the response, luckily for me the problem was actually much simpler. It ended up being a combination of two things, so not for sure which was the actual culprit.

1. We removed the condensate drain trap in the lower access panel and cleaned it out with water. When we flushed this out, lots of black/grey crud came pouring out which could have led to an intermittent shut-off of the system.
2. We removed the upper air intake pipe and after even further inspection, found a little brown leaf in the pipe.
3. We also cleaned the flame sensor with some steel wool to remove any oxidation.

All is fine so far!

Hope this information helps someone else out. I guess in hind sight, it is better to do a very in-depth cleaning job rather than try to diagnose broken switches or motors.

NiNe O

If this were my furnace, I would remove completely the hoses going to the white trap. Clean the collector box outlet(the black box that the opposite end of one tube is connected to), clean out the inducer motor housing outlet(other hose opposite end), clean out the tubing leaving the trap, clean out any and all pvc attached to that drain.

NiNe O

If this were my furnace, I would remove completely the hoses going to the white trap. Clean the collector box outlet(the black box that the opposite end of one tube is connected to), clean out the inducer motor housing outlet(other hose opposite end), clean out the tubing leaving the trap, clean out any and all pvc attached to that drain.