07-05-2019, 04:06 PM
Joe,
There are others here that know much more than I do about the ACs but I know the general things to look at.
1). Pull the filters and look at the coils...are they iced up? Another way to determine this is to feel the airflow coming out of vents. Is there a large or small volume of air coming from vents?
2). Measure the current flows with a clamp on ammeter. Since you have had the “board upgrade” it will be a little harder to get to the wires, but you want to measure the current going to the compressors. With the current measurements going to each compressor experts will be able to diagnose the likely culprit.
3). Once you do the external relay upgrade, it is very unlikely that the board will fail...but maybe a connector has failed. Look at both relays with your AC running. Is the little black button pulled in indicating the relay is active? If it is not pulled in then the trigger circuit / board is likely the problem.
This should get your started troubleshooting until a real expert chimes in.
Bill
There are others here that know much more than I do about the ACs but I know the general things to look at.
1). Pull the filters and look at the coils...are they iced up? Another way to determine this is to feel the airflow coming out of vents. Is there a large or small volume of air coming from vents?
2). Measure the current flows with a clamp on ammeter. Since you have had the “board upgrade” it will be a little harder to get to the wires, but you want to measure the current going to the compressors. With the current measurements going to each compressor experts will be able to diagnose the likely culprit.
3). Once you do the external relay upgrade, it is very unlikely that the board will fail...but maybe a connector has failed. Look at both relays with your AC running. Is the little black button pulled in indicating the relay is active? If it is not pulled in then the trigger circuit / board is likely the problem.
This should get your started troubleshooting until a real expert chimes in.
Bill
Bill Johnson
Birmingham, Alabama