DC PEAK / COMPRESSOR OVERCURRENT ERROR
Cause
Supply Voltage Issue.
Solution
Make sure the supply voltage to the unit is within correct range.
Check the spec sheet to see if the unit is 115V/208V/230V and that the actual supplied voltage +/- 10% of the rated voltage required.
Cause
Fan Defect.
Solution
Check to make sure fan is operating properly.
Cause
Airflow Restriction.
Solution
Make sure coils are clean and unit is properly installed with correct clearances.
Cause
Defective Main PCB, Compressor, or Refrigerant Leak.
Solution
Test Compressor circuit, Check for wiring harness issues. Check output voltage from Main PCB. Look for signs of leak.
DETAILS BELOW:
1) Make sure the supply voltage to the unit is within correct range. Check the spec sheet to see if the unit is 115V/208V/230V and that the actual supplied voltage +/- 10% of the rated voltage required.
2) Check to see if the fan is physically bound by a foreign object. If so, remove the obstruction and try running the fan again. If fan turns freely by hand but will not energize continue to steps below:
Testing should give the same
reading from any combination of wires.
(Yellow-Blue) (Yellow-Red) (Red-Blue)
1) Make sure the supply voltage to the unit is within correct range. Check the spec sheet to see if the unit is 115V/208V/230V and that the actual supplied voltage +/- 10% of the rated voltage required.
2) Check to see if the fan is physically bound by a foreign object. If so, remove the obstruction and try running the fan again. If fan turns freely by hand but will not energize continue to steps below:
3) Make sure the coils are clean. Dirty Coils like shown in the picture below will cause extra strain on the compressor. Make sure the unit is installed correctly, has clean coils, and proper airflow.
4) Check compressor circuit and wiring harness….
Any Combination of (W,V,U) Should give the same value below:
Ohm Value: 1.3 – 1.6Ω
Voltage: 200Vac
All readings are approximate and may change based on Inverter Output.
Can also check ohm reading at compressor (If compressor checks good directly at compressor prongs, then make sure and perform the test from the board as shown above to check the harness for issues..…
Any Combination of (Blue,Red,Yellow) Should give the same value below:
Ohm Value: 1.3 – 1.6Ω
All readings are approximate and may change based on Compressor Model.
5) Look for signs of refrigerant leak.
– Visually inspect for signs of oil or cracked tubing.
– Replace leaking part and repair sealed system.
***If unit contains R32 Refrigerant and is found to have a Sealed System issue then RA will need to be issued. Call TCC at 800-847-7597 with readings to properly troubleshoot***
* If no issues are found with above checks/tests then solution would be to replace the Main PCB as it could be giving a false error. But be thorough and check all areas above before replacing the Main PCB.
7 Responses
Very good help
Very good help
We need to know some case, Ch21 occur about 1h after ac compressor operate.
So how can we check to found the defect fast way weather ODU PCB or Compressor is defect?
If the coils are clean and no airflow issues are found, the fan and compressor are testing correctly, and the supply voltage is correct and steady and the code occurs intermittently then the board could be the issue. Unfortunately there is not a test mode or any other diagnostics for the window AC’s. But if all the steps in the troubleshooting article are passing then PCB would be the recommendation to try.
👍
We still do SSR on R134?
Yes.