[mrpandya]

Hi
This is my first post to forum and experts,
I have Lennox furnace,and problem is water leaking and loud pop noise when start.
In the pict. a green arrow shows water leaking and i never see and water coming out from a pipe which i indicate with red arrow,
i cant figure out from where its coming ,loud noise.
pls see attach picts.

please help'
Thanks

 

[danpik]

That being a condensing furnace, it will produce water while running. There should be a drain tube at the bottom of that pipe that will need to be unclogged. This is a fairly common problem on condensing furnaces.

 

[mrpandya]

Hi
I have already clean drain tube. Still same problem. I can not see water coming out drain tube altough tube is clean. How to check condense unit?? What is inside that black condense unit??
Thanks

 

[yuri]

That tube does not get a lot of water flowing thru it. It drains the small amount of water from the exhaust pipe when it shuts off. The actual condensate drainage is from the plastic collector box the exhaust fan attaches to.

In the Summer when it is dry I would take red or black rtv silicone and seal around the leak or put a gear clamp there. It needs to be dry or it won't cure.

The popping sound could be delayed ignition from the burners and can be dangerous. They may be dirty or rusty and need checking by a Lennox Pro. HARD to get them out and I am a Lennox tech.

 

[mrpandya]

Hithanks denpik and uri for quick reply.
I will try and let u know. There a small pipe attach at bottom of blower., its for water drain?? I can see very small amount of water there. Is it normal??
Thanks

 

[mrpandya]

Hi
i found service manual and from that i can explain technically, there is no water coming out from Flue drain hose and when i remove BOOT or CAP from flue trap assembly ,its full of water. water leakage from this BOOT or CAP. I hope i explain my problem right way.
Thanks experts.
Mac

 

[yuri]

The boot has to fill with water and overflow into that hose and it may not do that if there is not enough. It may evaporate. I would not worry about it. Take that black hose off and flush it with hot water as it can get mold or scuzz in it and put it back on and it should be OK.

 

[danpik]

It is possible that the small fittings may be plugged up. I would not reccomend removing them as over time they can become quite brittle. You can, however, blow back into the tube and clean out the clog. Usually when I run into these problems I disassemble the system and give the entire drain system a good cleaning. I had one last year that had the drain for the heat exchanger clogged up and it was filling with water after about a day of operation. It took some time to find it as by time I got there enough water had drained out that it was not a problem. The only clue I had was a tripped rollout switch after each call. When I replaced it and put the unit back into service it would take almost 12 hours of run time to fill back up enough to trip the switch. Once I figured out the problem I was able to clear the clog and drained a full pail of water out of it.

 

[mrpandya]

Thanks,
Yuri and denpik.

 

[mrpandya]

Hi
yuri
A tech. come today and told me , Combustion Air blower and Flue transition need to replace and asking for $ 800 do u think its worth to replace. ??
Thanks

 

[yuri]

Hard to say. That furnace is getting close to 15-20 yrs old and yeah the combustion blower usually needs replacing around then. Spins at 3000 rpms and that boot cracks too. However the pilot burner is old and probably corroded and I was never fond of the S86 ignition control system they used on that furnace. A few of them had cracked heat exchangers.

Point is it may need more repairs in the future. If you plan to stay in the house it may be better to get a newer better furnace. If you are leaving then fix it. Depends on how you like to spend money.

Most of my customers don't like to spend $1000 on a furnace once it gets that old.

No scare tactics. I work for a BIG company and if we don't advise them of the costs and it breaks down a week later for another $500 they get mad and say we did not tell them the whole story and want a refund or they complain to the BBB or whoever will listen.

 

[roughneck]

If it were the same issues, and same furnace, in my house, I would not spend that kind of money on a furnace that old. You could do it, and pay the money, and have some other random failure next week that would cost another $800.
You could always get a second opinion on the repair cost though.