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My thermostat is set to cool, on, auto. And i have power going to the contancter, but not coming out. my unit is not coming on. only when i push the contacter in manually. its a commercial package heat pump. I have the model and Serial numbers

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  • Mike McDowell May 11, 2010

    Is the interior fan running? If not try turning the fan setting to ON.

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The way you sound like the unit is short of freon you've to call in an Air conditioner service man to check it out .It is not just a reset work only. God Bless have a nice day. Dickson

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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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...

2 Answers

Ac not running


Your not very clear about your problem. You say it has "juice" but no power. Juice is power so exactly what are you saying? If you mean that there is power going to the unit but the unit is dead then you need to check if the thermostat and it's wiring are supplying power to the contactor (relay) If not then you could have a bad contactor or thermostat or an open in the wires that go from your theromostat to the transformer (which could also be bad) to the contactor itself. The contactor is what passes power to the unit when the theromostat demands cooling. If any part of that circuit is bad then the contactor will not close and even though there is power the unit will not work because the contactor points are left in their open position not able to pass the power onto the unit.

There is a simple test that you can do but you have to be very careful because your working with live wires. First make sure that the thermostat is set for cooling then go up to the unit and get an insulated tool like a screwdriver with a plastic handle and gently push the plastic part of the controller downward just for a few swconds. If the unit comes on then your problem is with the thermostat, or it's wiring, or the transformer or the contactor itself.

Good luck,

Marty

Jun 18, 2014 | Dometic Rooftop RV Air Conditioner

2 Answers

My unit to my house wont turn on outside. This happened last night at about 8:30. I have checked the circuit breaker/fuses and the little red switch on the unit itself-- I pushed that. I turned the...


Turn power off to indoor unit. Remove red, yellow and green wires from tstat and wire nut the three together. Turn power to indoor unit back on. This should bring on indoor fan and outdoor conpressor and fan. Let me know

Jun 22, 2017 | Fedders Q Chassis A6Q10F2A Air Conditioner

1 Answer

Unit does not run breakers on thermostat set to cool and fan is on auto but outside unit does not run


If this is a forced air split system, you can try a couple of things.

1) Turn off furnace open blower compartment door and remove thermostat wires. put a jumper between
R and Y. Put blower door back on and restore power.
If unit turns on, your problem is with the thermostat
or thermostat wire.

2) At the outdoor unit remove the electrical panel to
get to the contactor, push in the contactor and if the unit runs you need to check for 24v between R and C
at the control board where the thermostat wires are.
If you dont have 24volts you have a transformer problem.

Jun 15, 2010 | Heating & Cooling

1 Answer

Does not cool


CHECK FREON LEVEL...IF GOOD CHECK FOR DISCONNECTED
THERMOSTAT OR COMPRESSOR OR CONTACTOR WIRE AT OUTDOOR UNIT WITH POWER OFF. CHECK FOR A BLOWN CAPACITOR OR UNIT GROUNDED OR BURNT WIRE. BAD BREAKER OR SEE IF OUTDOOR FAN COMES ON AND COMPRESSOR KICKS IN ( MAKES WHIRRING NOISE ) .

INSIDE CHECK BOARD FOR BLOWED FUSE, GROUNDED WIRE, MAKE SURE SYSTEM IS GETTING 24 VOLTS, IF NOT CHECK THERMOSTAT WIRES OR TRANSFORMER ON INDOOR UNIT.. IF YOU SET THERMOSTAT TO OFF AND ON AND THE INDOOR FAN COMES ON..YOUR GETTING 24 VOLTS.NOW YOU NARROWED TO THE BOARD OR LOOSE WIRE, FUSE OR THERMOSTAT. IF YOU TURN YOUR UNIT ON COOL AND AUTO AND THE INDOOR AND OUTDOOR FANS COME ON AND THE COMPRESSOR KICKS IN
BUT IS NOT COOLING...CHECK AND POSSIBLY ADD FREON...
ALSO CHECK AND MAKE SURE INDOOR BREAKER IS ON.

Apr 09, 2010 | Heating & Cooling

1 Answer

It wont go into the heat side when i put thermostae to heat


If the fan comes on in Auto, thats a good thing, same if the cooling come on when put to cooling.

At the unit turn power off and remove and identify thermostat wires. Put a jumper wire between R an W or W1. Restore power, heat should come on.

If not,were there any wires attached to w or w1 before you started, if yes then you need to make sure the same wires and color are hooked up to same terminals at thermostat.

Jan 10, 2010 | American Standard WCZ036F Air Conditioner

1 Answer

Compressor doesnt come on in a dometic duotherm rooftop ac unit.Fan runs but no compressor


If this is a wall thermostat controlled unit, then check to make sure that you have power coming from the yellow wire on the thermostat when it is placed in the Cool/Auto High mode. If you do not have power at the yellow wire, then you have a bad thermostat. If you do have power, then remove the control unit from the inside of the AC and see if you have power at the Y terminal there. If so, when you turn the thermostat to cool, can you hear a relay clicking in the box? If not, then you have a bad control box. If the relay is clicking, you need to check the power at the compressor relay on the board. It has a black wire to one side and a purple (or blue) wire on the outgoing side. Check to see if you have 120V on the blue wire when the tstat is set to High/Cool. If not, then you need to bypass the freeze switch to make sure that is not the problem. If you do, then you need to go upstairs and check the start capacitor for OK. It is located in the side compartment of the upper unit, it has a small black relay on the top called a PTCR. These often burn out and will cause the compressor not to work. If that is fine, then you go to the top of the compressor to the thermal overload switch. See if you have power at both sides, if so, then you have a bad compressor. If not, then the overload switch is open and not allowing power to the compressor.

Jun 25, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Central air conditioner doesn't turn on... Any suggestions?


If the compressor turns off and won?t come back on during a very hot day, the unit may have built up a high "head" pressure and the high-pressure limit switch may have tripped. This is usually located right inside the access panel on the compressor unit. Simply push the button to return it to operation. If your central air conditioner doesn't go on automatically: 1) Be sure the thermostat is set to "cool" and set below room temperature. 2) A central air conditioner should be on a dedicated 240-volt circuit; check the main electrical panel and any secondary circuit panels for a tripped breaker or blown fuse. If you find the problem here, reset the breaker or replace the fuse. 3) Make sure the furnace power switch is turned on and that the outdoor condenser's power switch, mounted on the outdoor unit, hasn't been shut off. Also be sure the 240-volt disconnect next to the compressor (in a metal box, usually mounted on the house wall) hasn't been shut off. 4) Turn off the power to the air conditioner and check the thermostat. 5) Remove the thermostat's cover and unscrew the wire from the Y terminal. 6) Turn the power back on. 7) Holding the wire by its insulation, touch the bare end to the R terminal and hold it there for about 2 minutes. If the compressor kicks on, the thermostat is faulty; replace it or call an air conditioning technician. If the compressor doesn't go on when you hold the two wires together, turn the power back off and call a service technician.

Jan 18, 2006 | Haier Energy Star ESA3183 Air Conditioner

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