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Old 04-07-2013, 09:10 AM   #1
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HELP - Lennox C33-30B-2F-3 Leaking Water


Hi guys. Just discovered this forum. My 2007 Lennox C33-30B-2F-3 was found leaking water this morning. There was a good size puddle on the floor. I don't know crap about HVACs but I am ex-navy so am used to dealing with pipes/drains/etc. and stuff breaking.

Anyway, not sure where to start. The water seems to come from the middle level, dripping down through the metal into the bottom level where a fan is(?). The top of that middle level is not wet, just the bottom. The circutry in the bottom is not wet at all. I poured some water down the overflow drain(?) on the right, picture attached, and it seems to be working fine so no problem there.

One comment - last night i switched the thermostat from cool to heat without turning it to 'off' first. First time i did that - not sure it it mattered.

Thanks for any assistance.
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HELP - Lennox C33-30B-2F-3 Leaking Water-dscn2747.jpg   HELP - Lennox C33-30B-2F-3 Leaking Water-dscn2748.jpg   HELP - Lennox C33-30B-2F-3 Leaking Water-dscn2749.jpg   HELP - Lennox C33-30B-2F-3 Leaking Water-dscn2751.jpg   HELP - Lennox C33-30B-2F-3 Leaking Water-dscn2753.jpg  


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Old 04-07-2013, 11:07 AM   #2
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HELP - Lennox C33-30B-2F-3 Leaking Water


you will have to disconnect the drain pipe where it attaches to the AC coil and clean the opening with a bottle brush. after 6 yrs sludge builds up in there and can block it. if they glued the fittings all the way to the coil then you will have to chop the pipe and recouple it back together with a larger piece of clear tubing or hose and 2 gear clamps. it is not under pressure. or you can slip a coupling over the pipe and tightly wrap electrical tape around the joints. McGyver method but it works and I do it.

that drain port should be inspected and cleaned once a year or water can overflow and do up to $1000 in damage to the board or motor etc.

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Last edited by yuri; 04-07-2013 at 11:10 AM.
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Old 04-07-2013, 11:57 AM   #3
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HELP - Lennox C33-30B-2F-3 Leaking Water


I see. thanks for reply.

I should also note that I had the A/C on last night for probably 6-7 hours when the temp was probably below 50 degrees. Probably only the 3rd or 4th time this year that I have used it.

Think that was a cause?
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Old 04-07-2013, 12:34 PM   #4
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HELP - Lennox C33-30B-2F-3 Leaking Water


Possibly and that is a BAD thing to do. You should never run an AC when it is less than 50F as there is not enough load on it and it can overcool and freezeup the AC coil and drain port and seriously damage the compressor. You should still unclog/check the drain connection as it is time for it to clog anyway. Don't want to be kickin yourself in the butt when it does clog/overflow and damages the board or motor.
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Old 04-07-2013, 12:52 PM   #5
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HELP - Lennox C33-30B-2F-3 Leaking Water


Residential A/C units are not made to operate when its 50 outside. they will tend to freeze the indoor coil when ran under low outdoor air temp conditions.
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Old 04-07-2013, 12:57 PM   #6
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HELP - Lennox C33-30B-2F-3 Leaking Water


Yeah and it is too bad the cheap dam*n manufacturers dumbed down the units and took out the low ambiant controls which used to be a standard feature. along with the low pressure switch. sure creates a lot of compressor changeouts/work for us and sales of compressors for them. But wait! do I smell a conspiracy here?

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