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I replaced the fuses with the proper ones thinking that that was why fan on ac unit was not on. I did the 24 hour off on electrical panel, and replaced fuses, now i hear a click then a humming sound coming from the unit but it seems its not turning on, power is reaching it but it still wont turn, I checked to see it fan was stuck or frozen, but it does turn.

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The humm you hear is the compressor. Turn your unit on and let it run for a couple minutes and grab the large pipe at the outdoor unit. If it's cold, your compressor is running. If your fan didn't turn on, there is a good chance your motor is fried. It could be your contactor, but I doubt it. The compressor and fan are wired through the same contactor, so when one comes on, so does the other. DO NOT run your unit for more than a minute or two with the outdoor fan not running. If you continue to run it, it's going to go out on high pressure and turn back on, and so on, and so on, until it fries the compressor.

Posted on Sep 28, 2010

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1 Answer

Carrier electric furnace (air handler) stopped running


The 5 amp fuse may be bad, they go quite often, and they are exactly the same as the car ones. Check the fuse with a meter. If its OK turn the unit on and check for voltage going to the blower fan. You should get a reading between at least one pair of wires. The unit should have a schematic on it somewhere, check it to see which wire pairs are used for the variable speeds of the fan.

Nov 08, 2014 | Heating & Cooling

1 Answer

Compressor want come on


Here is what to do . Pull out or turn off Electrical disconnect behind unit . Carefully remove panel covering controls in unit . Note most units have a flat panel with a few screws, but some GE units have a welded metal box on top of unit which needs to be removed. After exposing controls. replace or turn on disconnect. Then take a plastic handled screwdriver and push in on center of contactor (boxlike part with a lot of wires hooked ) If the compressor now comes on release contactor , and check for 24 Volts AC at base of contactor where thermostat (small wires that run on outside of black refrigerant line ) with thermostat on and calling for cool you should measure 24 to 28 volts . If voltage is present replace contactor after disconnecting from power. If no voltage go inside , remove cover from thermostat, and check for 24 volts between red ( R) and yellow (Y ) terminals on thermostat , If voltage is present , replace thermostat , no voltage check voltage in heater / air handler if you have voltage at air handler , replace thermostat wire from heater to thermostat / if no voltage check for blown fuse in heater , this should be either an inline fuse or an automotive type fuse plugged into circuit board (with power to heater disconnected check broken wire or black mark in fuse when held up to light. If fuse good turn on power to heater and check for 230v to one side of transformer, if you get voltage to Primary (incoming side ) of transformer, check output side of transformer for 24 - 28 volts. If transformer shows input but no output replace transformer after turning power off. If you heard a buzzing or grinding noise , when pushing in contactor , but compressor didn't start look at run capacitor (this is round or oval shaped object with wires going to contactor and compressor ) Looking at area where wires plug this should be a flat surface , if it looks domed shaped or bulging out , it is blown and needs replaced , use same mfd rating and 440 Volts to be on safe side. / If there was no noise from compressor when contactor was pushed in , put your hand on top of compressor (black object in center of unit ) If hot , allow to cool for at least three hours with power to unit turned off and retest . If compressor comes on after cooling , check for bad fan motor in outside unit (it may make a squealing or wining noise and stop runing for a while , also check for / clean outdoor coils
Hope this helps .
Thanks,
Alex


Oct 04, 2014 | Carrier Comfort 3.0 Ton 13 Seer Ac Only...

1 Answer

Why is my AC not turning on in the outside unit??


1st off check the breaker for the unit outside,
reset it off and then back to on, it should positively click,
if crunchy or anything other than a crisp click,replacement is indicated.
If that is not the issue, go to the electric disconnect at or near the unit.
It may be on the wall with a cord going to the AC unit.
Open the lid and see if there is a fuse block/plug that has a metal handle, remove and test/ohm the fuses for continuity, if no tester is available
a battery and a light will work with wire, just use the fuse in the circuit
to see if the light works.Odds are the fuses, Time delay type fuses
(important) are blown/bad.Always buy time delay fuses! the non delays will fail, its a good idea to replace these every other summer.
If this is not the issue then the "contactor", a 24 volt electromagnetically actuated relay is what controls the high voltage to the fan and compressor
in the AC unit. You will need a meter to check for power,
24 volts at the coils terminals on the contactor and 220-240v
at the contactors terminals.Carefully depress the contactors top part that moves with contactor energization with an insulated screwdriver, this will simulate the contactor operating normally,and if that works you know the issue is not the compressor or fan.As always with power unless familiar with it, I dont suggest to try the testing beyond the fuses.

Sep 09, 2011 | Ruud UBHC Air Conditioner

1 Answer

I have a whirlpool central air conditioning and the condenser stoped working. what could I expect it to be?


When you say the 'condenser' stopped running - I'm 'assuming' you are talking about the outside unit, and I'm also 'assuming' that when you say it stopped running you mean 'nothing' runs on the outside unit - fan motor OR compressor. The fan motor will drown out the compressor running noise which is a 'low rumbling' sound - often not heard by the layman because of the noise the fan motor puts out.
Assuming you are talking about the outside unit and 'nothing' is running either fan motor or compressor then you might be 'in luck.' Because the most likely reason for the outside unit to be totally off will be a 'blown fuse' or a 'tripped breaker.' The good news is that in 'hot weather,' especially the kind of hot weather that has been present this summer (especially in the south) - blowing a fuse or tripping a breaker is not necessarily an expensive repair.
Indeed, it's not uncommon for a AC unit to blow a fuse (or trip a breaker) on occasion, although it must be noted that doing so is also is sign on something seriously wrong with your AC, i.e. a fan motor breaking down electrically or even a Compressor, both being expensive items to replace.
But, as I said, it's not uncommon for a fuse to blow once in awhile.
I would check my fuses (and breaker) and see if this is what has happened.
If you have fuses (usually located outside close to the condenser) and have no way to check them (you check them with a ohm meter looking for continuity) - then just 'replace' them with new ones. Note: always put 'time delay/dual element' fuses back in - even if the ones that are in there now are 'one time' fuses. 'Time delay' fuses do just what they say they will do - (they hold for just a second or two during that initial start up (of the compressor) without blowing).
If a blown fuse/tripped breaker is your problem then "most" of the time the AC will run ok and you will not have any more problems.
However, if after replacing the fuses and turning the AC back on - the fuse(s) blows instantly, or a short period thereafter (say a few minutes or an hour) then you probably have a problem that is causing it - i.e. the fan motor or compressor is going bad.
Note: one thing that you can fix that might be causing the fuse to blow is a dirty condenser. So, check the condenser coil (think of it like a car's radiator). It 'must' be clean to run properly and when it gets 'really dirty and clogged with dirt it will cause high head pressure and can cause the unit to blow fuses and trip breakers.
Good Luck!

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1 Answer

No cool air


is the AC unit running outdoors? if not , check breakers , and in the electrical disconnect mounted on the wall or unit, there are time delay fuses that can go n
bad. IIf fine with electricity, remove the A/C panel to elec components and depress the contactor to make compressor and fan run, if it does the low voltage(24 volts) isnt making it on yellow and common wire of 24 volt control circuit.

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1 Answer

AC Breaker trips and AC Fan turns slow.


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1 Answer

AC wont turn on after replacing 3 amp


My guess would be that your cable installer drilled into or nailed into an electric supply to your AC. I'd suggest calling the cable company (groan,......) (30 minutes later,.....)
Oh hello,.....
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2 Answers

FUSE BOX DETAILS


left to right...
1. empty
2. e flashers
3.horn, brake lights
4.clock, trunk light, inside light, radio
5. rad. cooling fan relay (AC only)
6. right side running lights
7. left side running lights
8. right high beam and indicator
9. left high beam and indicator
10. right low beam
11. left low beam
12. reverse,turn signal and inst panel
13. main and transfer fuel pumps, auxiliary air reg., ox sensor heater
14. license plate and glove box light
15. wipers
16. rear defogger
17. heater blower (no AC)
18. cig lighter
19. rad cooling fan (no AC)
20. Heater blower (AC)
21. rad cooling fan (AC only)
22. empty
23. Ox sensor, idle stabilizer,seat belt warning relay, (Digifant only, control unit, idle boost control, idle boost valve)
24. inst panel lights, heater control lights
25. reading lamps
26. empty
27. empty
28. empty

Hope this helps...;-)

Apr 17, 2009 | 1992 Volkswagen Fox

1 Answer

AC Control Transformer keeps failing.


well it has blown the fuse on the transformer, then you have coil switch bad.It could be the coil on the contath in for cooling.But can check by taking the yellow wire a loose and see if the don't blow. The red wire is one side of the transformer and the com could be any color.But look at the red wire because it is the main wire that travel the voltage throuhg the unit.

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1 Answer

I have a Carrier 38tra048340 ac 4 ton unit outside, heater in attic. Thermostat is Totaline P374-1100. Power went out than back on after a few hours due to vehicle crashing into power pole. AC was running...


Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

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