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Relay switch goes on and off. Fan is running.

Relay switch goes on and off. Fan is running. Not cooling

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The starter relay on the compressor may be faulty, I presume that is what you are hearing, a sort of click noise?

Posted on Mar 05, 2009

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Posted on Jan 02, 2017

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

Tip

How to wire a fan relay


A fan relay has 2 switches, a NC, normally closed switch
and a NO, normally open switch.
The relay has a coil that acts as an electromagnet and when energized with 24 volts from the thermostat will close the NO and open the NC switches.
The NO switch is the High speed , the NC switch goes to Low speed however as it is NC a temperature or time delay is what actually controls the low speed, low speed is the heat speed.
The NO switch in the fan relay goes directly to the High speed lead, this is the Cooling speed and the Fan On speed.
The 24 volt coil in the fan relay is wired to Green from the thermostat and Common 24 volt neutral leg.

on Oct 14, 2013 | Ruud Rheem Enclosed Fan Relay 42-25104-06...

2 Answers

2004 Chevy Monte Carlo 3.4 the a/c stopped blowing,then it started overheating to the red within a couple miles,replaced the thermostat,the relay switch some days it overheats sometimes it runs fine


Are the cooling fans coming on ? What relay switch did you replace ?
The BCM will request low speed cooling fan operation from the PCM under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 103?°C (217?°F).


?€¢
When A/C is requested and the ambient temperature is more than 10?°C (50?°F).


?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).


?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is more than 117?°C (243?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.


The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the PCM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the engine wiring harness junction block. The ground path is provided at G101.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the FAN CONT #1 relay coil, closes the relay contacts, and supplies battery positive voltage from the FAN CONT #1 fuse through the cooling fan motor supply voltage circuit to the right cooling fan. The ground path for the right cooling fan is through the FAN CONT #2 relay and the left cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the FAN CONT #1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the FAN CONT #2 relay and the FAN CONT #3 relay through the high speed cooling fan relay control circuit. This energizes the FAN CONT #2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the FAN CONT #3 relay coil is energized closing the relay contacts and provides battery positive voltage from the FAN CONT #2 fuse on the cooling fan motor supply voltage circuit to the left cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Is your vehicles check engine light lit ?
Is the

Jul 10, 2015 | Cars & Trucks

1 Answer

Replaced bad blower motor and now motor will not run in a/c only in heat. I added a relay and wired for one speed to run in heat (tied into sequencer) and another speed in cool (off added relay). When...


You need to use a fan relay with one normally open and one normally closed contact. Run Hi speed (cool) through the normally open contact. Run Lo speed (heat) through the normally open contact of the sequencer and then through the normally closed contact of the fan relay. Make sure your thermostat isn't energizing the fan relay in heat and cool modes. If it is you can switch the heat option switch to Gas instead of electric on the back of the T'Stat and the fan relay will only energize in Cool mode

Nov 25, 2017 | Heating & Cooling

1 Answer

Y does 2004 ac pontiac grand am


Need more info. Do you mean the blower doesn't seem to run or do you mean it doesn't cool sitting at a stop? Does the blower run at all four speeds? Raise the hood. Start the engine. Turn on the AC to MAX and fan switch set to High. Go to the front of the car and see if the radiator fan or fans if it has two, are working. If they aren't you need to check the cooling fan relay and possibly replace. Cavalier's have only a single fan (not two) so when the cooling relay goes out it doesn't cool at a stop and begins to overheat as well. Not sure if the Grand Am has one fan or two at the radiator.

Jul 11, 2014 | Vehicle Parts & Accessories

4 Answers

Why won't the fan motor shut off on my 1991 acura legend?


Hey chandralebea,

Try first by replacing the cooling fan engine temp sensor switch, as this may be the cause.



Good Luck

Jul 29, 2012 | 1991 Acura Legend

3 Answers

Cooling fans will not come on


Hi,

Fan Relay switch is stuck open. This of course assumes your temperature sensor is working appropriately. Which I assumed since you seem to know that the engine is running hot.

Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.

Until you get the relay switch replaced, you can either by-pass the relay switch and directly connect the fans to the battery, or turn on your A/C ALL the time and use it at a minimum setting. This will keep the cooling fans running at all times.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Jul 26, 2009 | Volkswagen Jetta Cars & Trucks

2 Answers

Cooling fan for rad not working.. if relay is


either the relay has shorted out or the coolant temperature sensor has failed. start witht he relay, install a new one and see if the situation improves, if not then do the temp sensor.

Jul 18, 2009 | 2006 Chevrolet HHR

1 Answer

Blower fan stays running. Fan relay attached to small circuit board (coil tabs [timer?]). Capacitor on small circuit board had ''fallen out'' of ic board. Tried to get replacement board, and was sold...


If fan runs on 220 you have one constant 110 that always goes to the motor. The other 110 goes through something that will turn it off and on. This being the relay, just like a light switch. This 110 will land on the "N O" (normally open) set of contacts. "Open" meaning the voltage can't pass through. When the relay gets energized the contacts close. This completes the circuit, the motor gets the 220 it needs and it runs. On the relay coil (how it gets it's energy) you need a low voltage common and you need the "G" wire from the tstat. Likely green in color, this is your indoor blower low voltage wire. When the tstat calls for fan, cool or heat, the relay energizes, closes the contacts, fan runs. Good Luck!!

May 16, 2017 | Carrier Heating & Cooling

1 Answer

1993 honda lx run cool while running ,but after it


check thermostat might be sticking or radiator may need flushing if it only heats up while idling check your electric fan may not be coming on try turning on the a/c the 2 cooling fans should come on then if they do then i would check the cooling fan switch if they do not come on when the a/c is switch on you may have a bad electric fan motor or wiring to the fan or fan relay

Feb 26, 2009 | 1993 Honda Accord

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