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Message
re: Help me diagnose my A/C issue...condensing unit not turning on...
Posted on 5/5/16 at 1:54 pm to Chicken
Posted on 5/5/16 at 1:54 pm to Chicken
What type of unit do you have? Maybe I could find a control schematic online. With the info you have given, it's likely that a review of the control diagram will point to one or two obvious culprits
This post was edited on 5/5/16 at 1:56 pm
0
Posted on 5/5/16 at 1:55 pm to meauxjeaux2
quote:
definitely starting to sound like a control board
Kind of where I'm going.
Posted on 5/5/16 at 2:02 pm to Chicken
exact thing happened to me. Change the batteries in your thermostat.
Its not getting enough voltage to pull in contact
Its not getting enough voltage to pull in contact
This post was edited on 5/5/16 at 2:05 pm
Posted on 5/5/16 at 2:07 pm to Tic44
quote:
Change the batteries in your thermostat.
Its not getting enough voltage to pull in contact
the batteries don't send voltage dufus. The low voltage comes from the transformer.
Posted on 5/5/16 at 2:09 pm to meauxjeaux2
quote:
the batteries don't send voltage dufus
hmmmm....then why do you need them
Posted on 5/5/16 at 2:13 pm to Nawlens Gator
drip line has a clean out on it I would pour a 1/2 gallon of bleach down the line will clear out any algae. I do this every year attic gets so hot the water left in the line turns to algae and clogs it up backs up in the pan and the switch turns it off
Posted on 5/5/16 at 2:21 pm to Tic44
quote:to power the thermostat. Period.
hmmmm....then why do you need them
Posted on 5/5/16 at 2:45 pm to TigerFred
quote:they are coming tomorrow...I am hoping to drop some OT knowledge to steer this guy in the right direction.
What are you waiting for? Call them back out.
Posted on 5/5/16 at 2:46 pm to Chicken
Like Meauxjeaux said. Sounds like a circuit board. Take a video of what it is doing so you can show him.
Posted on 5/5/16 at 3:12 pm to meauxjeaux2
LINK
Check for low batteries -One of the most common issues we discover is that the batteries are low in the thermostat. Although the it may not seem as though a low battery in the thermostat will effect your furnace or A/C unit, it can and it does. It is always worth a shot to change your batteries, even if the low battery light is not on.
If You Have a Digital Thermostat, Check Your Batteries:
• If the batteries in your digital thermostat are low, it won't call for your air conditioner to come on. • Normal battery replacement schedule is every TWO (2) years.
LINK
not trying to be a dick, but the very same thing Chicken described happened to me. AC man changed out my batteries and everything worked...Just sayin
Check for low batteries -One of the most common issues we discover is that the batteries are low in the thermostat. Although the it may not seem as though a low battery in the thermostat will effect your furnace or A/C unit, it can and it does. It is always worth a shot to change your batteries, even if the low battery light is not on.
If You Have a Digital Thermostat, Check Your Batteries:
• If the batteries in your digital thermostat are low, it won't call for your air conditioner to come on. • Normal battery replacement schedule is every TWO (2) years.
LINK
not trying to be a dick, but the very same thing Chicken described happened to me. AC man changed out my batteries and everything worked...Just sayin
This post was edited on 5/5/16 at 3:14 pm
Posted on 5/5/16 at 4:16 pm to meauxjeaux2
quote:
quote:to power the thermostat. Period
hmmmm....then why do you need them
Actually, for many thermostats you don't need or even have batteries. If you have a programmable thermostat, it would be for memory backup and possibly to power the LCD screen.
ETA: I stand corrected, apparently many of the newer digital thermostats do require battery power to function properly. That power is only for the circuit board, though, not to pull in the contractor.
This post was edited on 5/5/16 at 4:24 pm
Posted on 5/5/16 at 5:24 pm to mdomingue
Correct. Ole baw above you just doesn't get it. Can a dead battery make the AC not come on? Yeah sure but that is not what Chicken said his AC is doing.
Posted on 5/6/16 at 7:43 am to meauxjeaux2
quote:
Ole baw above you just doesn't get it
my Honeywell thermostat has contacts that close when the temperature gets above or below the setpoint. If they batteries don't have enough voltage for those contacts to close, then the damn AC doesn't come on.
Its not an old mercury filled thermostat that the contacts close without voltage, its one that REQUIRES voltage for the contact to close....OLD BAW
This post was edited on 5/6/16 at 7:45 am
Posted on 5/6/16 at 8:08 am to Chicken
Is your condensation pan full? There's a trip sensor when it gets to a certain level it shuts off the unit.
Posted on 5/6/16 at 8:09 am to Tic44
i never said that it pulls in the contactor, but the batteries do close a contact
Posted on 5/6/16 at 8:24 am to uway
quote:
Is your condensation pan full?
A technician has been out already. They would have noticed this. Also, not all units will shut down when the drip pan is full. Hence the overflow pan and drain line. Also, why people always end up with brown stains when their lines get clogged (which reminds me I need to go clean that out).
This really sounds like a relay/circuit issue. It's not triggering your compressor to kick on, only your fan. And then you are just circulating room temp air. In that scenario, the fan is going to stay on, because you never cool the air down enough for the T-stat to kick it off. Now the fan staying on when you turn the whole thing off, is another indication that a relay is not switching properly when sent a signal and therefore the fan doesn't shut off. I believe that if attics go through temp cycles, it can warp the components ever so slightly to the point that proper contact cannot be maintained. Sometimes just pushing on them get them to work, but they should be replaced anyway (cheap). I'm saying all of this off of memories from a bout 3 years ago when I went through the same thing. I could be slightly off.
ETA: Again, racking my brain and could be totally making this up, but I think my issue took a few trips to figure out as well since the relay sometimes worked like in your case. One of those things that never would mess up in front of the technician. I think the second time I called them out, they just changed a part on a guess and it worked after I described what was happening. 3 years and a different house, so I'm not 100% on that though.
This post was edited on 5/6/16 at 8:39 am
Posted on 5/6/16 at 8:33 am to KG6
quote:
This really sounds like a relay/circuit issue
agreed
Posted on 5/6/16 at 10:16 pm to Chicken
quote:
Residential Service customer made service call because upstairs ac
was not working. Upon arrival applied demand for ac on upstairs Tstat.
System was operating as intended. While inspecting outdoor unit the 24
volts at contactor was lost. Made sure all electrical connections were
good at outdoor unit. Then went to indoor unit and made sure all
electrical connections were good. Also removed Tstat from wall to
ensure all low volt wires were in proper place. Did not find any electrical
faults. Reinstalled Tstat on wall applied cooling demand gave unit 30
minutes of run time and did not lose 24 volts again. If we are called
again by homeowner within 30 day for same issue no service fee will be
applied.
Fire this company immediately. This guy needed to find where or why the system was dropping the 24 volts. Connections...really? Sounds like your transformer is failing, a relay is failing, your pan is filling, thermostat is failing or your circuit board has a relay failing.This guy either doesn't know what he's doing or doesn't care.
This post was edited on 5/6/16 at 10:27 pm
Posted on 5/7/16 at 10:29 am to Tic44
quote:
my Honeywell thermostat has contacts that close when the temperature gets above or below the setpoint. If they batteries don't have enough voltage for those contacts to close, then the damn AC doesn't come on.
Its not an old mercury filled thermostat that the contacts close without voltage, its one that REQUIRES voltage for the contact to close....OLD BAW
OMFG.
Did you not read where he said the inside unit stays running?
So. The AC is working. The entire unit just isn't functioning. Something is going on with the signal to the outside part of the system only. That is not the responsibility of the thermostat.
Posted on 5/7/16 at 10:45 am to Chicken
Did you check the condensation pan?
It might be draining slow so the unit cools for a while but when the pan fills up, the mercury float rises and shuts off the condensing unit to prevent an overflow in your attic.
By the time you or your AC man goes into the attic, the pan has drained.
It might be draining slow so the unit cools for a while but when the pan fills up, the mercury float rises and shuts off the condensing unit to prevent an overflow in your attic.
By the time you or your AC man goes into the attic, the pan has drained.
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