Discharge Temperature Error

Discharge Temperature Error

Discharge temperature error codes by model:

10x Operation & 1x Timer:

RL2 series, RLS3 series, RLS2 series, RLB/RLXB series, RLF series, RLF1 series, LUAS1 series, LMAS series, LZBS series, LZAS series, LPAS series, RGLX series, RLE series

7x Operation & 2x Timer:

RLS series, RLXS series, CQ series, RQ series, R2 series, RL series, RML series, RMLQ series, CLX series, CLX1 series, RLX series, RLXQ series, CL1 series, CL series, RLQ series

5x Operation & Continuous Timer flash:

ABU18RULX, ABU24RULX & ABU36RSLX

10 flashes LED A & 1 flash LED B:

AOU36RLXFZH & AOU45RLXFZ

2 flashes on Power Mode LED, Solid Error LED, 10 flashes on L1, 1 flashes on L2, Solid L6 LED:

AOU30RLXEH

EA11:

AOU48RLXFZ & AOU48RLXFZ1

A1 / 0F Wired remote:

UTY-RNBYU, UTY-RNNUM, UTY-RVNUM, UTY-RSNUM, UTY-DMMUM, UTY-RSRY & UTY-RNRUZ Series

Discharge Temperature Error Troubleshooting Checklist

1. Pull disconnect for 5 minutes, code should reset and disappear, if it does not, ohm out discharge thermistor.
2. Place gauges on unit and put the system into cooling, high fan, 64 degrees and Test-Run. Check running suction pressures. (Low side)
3. If pressures are significantly below 110 / 130 PSI it is likely the system is either low on charge and/or has a leak somewhere.
4. Turn power off to the disconnect and recover the charge and with the charge removed from the system, check for restrictions and blow high pressure Nitrogen throughout the condenser, piping, and evaporator.
5. If no restrictions found, pressurize the condenser up to 600 PSI and with soap and bubbles spray for leaks on the condenser coil, flare nuts, U-bends, etc. Leak detecting can be performed with an electronic leak detector however, it is a less effective method than soap and bubble testing.
6. Wherever leaks are found that part must be replaced. Ex. leaks found on the condenser coil, U-bends, flare nuts, or 2-way / 3-way valves, etc. must be replaced.
7. While the power is off to the system, it is a good practice to ohm out the electronic expansion valve (EEV). To locate where the EEV is located for the model in question, refer to the Service Manual which contains details wiring diagrams and schematics. Instructions on how to ohm the EEV out can be found here.
8. If no leaks are found from leak detecting reweigh in the factory charge keeping in mind that you must accommodate for an added pipe length if longer than what the factory charge covers. Refer to the model in question's Installation Manual for calculations on how much refrigerant to add per foot of added length.

Disclaimer:

Always Practice Safety First. Turn off power before commencing any work.  In order to perform some of these tests an electrical and/or refrigerant license is required. We strongly advise to check the Service manual for more detailed explanation. If you are not sure about these recommendations please contact our technical support line at 866-952-8324. Fujitsu General America, Inc. is not responsible for any damage and/or harm caused by unsafe acts during these test.