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Old 09-03-2010, 11:02 PM   #1
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HVAC not cold


I had annual checkup on both HVAC 2 weeks ago and the tech found that the capacitor to the upstairs unit was alittle below tolerance level and need to be replaced, he also saw that the freon level was low and he filled it up with 1lb of freon. The downstairs unit was good.

Past few days I notice that the upstairs blower was working a bit harder and seems to take longer to cool, so I decided to replace the blower capacitor in the attic. I removed the pull-out fuse and took out the old capacitor to replace with new. Put the fuse back in and it ran.

Trouble now is it's not blowing cold air like downstairs, it's blowing mildly cool air if not just air.

I've tried the downstairs good thermostat and moved it upstairs and didn't make any difference. Both thermostat appeared to be good.

The outdoor condenser appeared to be running ok, though the large copper pipe is not cold like the downstairs one. Also notice the air blowing out of the condenser is cool, not warm like the working unit. The capacitor seems rather hot comparing with the downstairs one. I'm guessing coz it's been running trying to cool the rooms.

In the past I replaced the capacitor to the outdoor condensor unit to fix the problem, but this time I tried a spare capacitor I had and didn't seem to make a difference.

Any thoughts on what the problem is or idea what to check?

TIA


Last edited by xrterra; 09-03-2010 at 11:11 PM. Reason: more info
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Old 09-04-2010, 03:01 AM   #2
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HVAC not cold


Either it loss more gas. Or the tech over charged it.

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Old 09-04-2010, 07:56 AM   #3
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HVAC not cold


Though it seems unlikely, I haven't rule that out.

I did notice I don't hear the hiss sound like I hear on the other unit.

It's a Honeywell unit and I don't believe there's any reset button on the condenser unit.

Not sure if there's any way to jump the wires, either on thermostat or circuit board on condenser, to force the freon out to see.
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Old 09-04-2010, 08:30 AM   #4
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Honeywell doesn't make central A/C's.

Your thermostat is probably a Honeywell, but not your equipment.
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Old 09-04-2010, 02:23 PM   #5
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Yes, Honeywell thermostat and Carrier HVAC.

Besides capacitor and freon, what else would cause the larger pipe from getting cold?
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Old 09-04-2010, 06:41 PM   #6
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bad compressor.
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Old 09-04-2010, 07:09 PM   #7
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Could also be a partial restriction. If the tech was not paying attention he could very easily have mistaken a partial line blockage as low freon .
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Old 09-05-2010, 12:49 AM   #8
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Went back up to check the blower unit again. Checked evaporator coil in the ACU and notice the line was freezing up. It's not the entire coil, The air filter was somewhat dirty and replaced with a new one as a precaution. Strange part is the large copper pipe that comes into the ACU is not frozen.
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Old 09-05-2010, 02:40 AM   #9
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that is a symptom of a restriction or you suddenly developed a leak.
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Old 09-05-2010, 04:20 AM   #10
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Quote:
Originally Posted by hvaclover View Post
that is a symptom of a restriction or you suddenly developed a leak.

Yep. Need someone to hook up their gauges and see whats going on.
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Old 09-05-2010, 11:46 AM   #11
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HVAC not cold


man, that looks eerily similar to what my evaporator coil looked like that i recently replaced. it was also a carrier unit and it was freezing up in one section of the coil, just like that. using a cheap leak detector, i detected several small pinhole leaks. however, it took well over 6 months from the time the tech topped it off to the time it started freezing up.

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