Manual for 4SCU20LX 4SHP20LX

Brand: Allied Air Enterprises

Category: Heat Pump

Manual Type:

Language:

Uploaded: March 30, 2025, 4:26 p.m.

Manual Publish Date: 2015-08-01

Warranty Summary

No warranty information provided in this manual.
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Power-Up/Outdoor Reset Sequence:

  • Initiates a 3-minute anti-short cycle delay.
  • Checks temperature and pressure sensors.
  • If no errors, energizes CNTCTR terminals to engage contactor coil (approx. 60 seconds).
  • Contactor pulls in, applying main power to the compressor inverter.

Operational Response:

  • Thermostat sends cooling percentage demand.
  • Outdoor control demands compressor start and capacity, and fan motor operation.
  • Indoor unit receives signal to start supply fan at demanded CFM.

Troubleshooting and error codes

Responsive Table
Alert Codes Inverter Code Inverter LED Flash Code Priority Alarm Description Possible Causes and Clearing Alarm
E 105 N/A N/A Moderate Outdoor control lost communication with thermostat or indoor unit. Check wiring, noise sources. Resets after communication restored.
E 120 N/A N/A Moderate Delay in outdoor unit responding to system. Check wiring. Clears automatically.
E 124 N/A N/A Critical Wi-Fi® thermostat lost communication with outdoor unit. Check wiring, power cycle. Clears after communication re-established.
E 125 N/A N/A Critical Hardware problem with outdoor control. Replace outdoor control. Clears after 300 seconds if recovered.
E 131 N/A N/A Critical Outdoor unit control parameters corrupted. Reconfigure system. Replace control if needed.
E 132 N/A N/A Critical Internal software error. Replace outdoor control.
E 180 N/A N/A Critical Outdoor ambient temperature sensor malfunctioned. Check/replace sensor. Clears upon configuration or normal values.

Troubleshooting and error codes

Responsive Table
Alert Codes Inverter Code Inverter LED Flash Code Priority Alarm Description Possible Causes and Clearing Alarm
E 105 N/A N/A Moderate Outdoor control lost communication with thermostat or indoor unit. Check wiring, noise sources. Resets after communication restored.
E 120 N/A N/A Moderate Delay in outdoor unit responding to system. Check wiring. Clears automatically.
E 124 N/A N/A Critical Wi-Fi® thermostat lost communication with outdoor unit. Check wiring, power cycle. Clears after communication re-established.
E 125 N/A N/A Critical Hardware problem with outdoor control. Replace outdoor control. Clears after 300 seconds if recovered.
E 131 N/A N/A Critical Outdoor unit control parameters corrupted. Reconfigure system. Replace control if needed.
E 132 N/A N/A Critical Internal software error. Replace outdoor control.
E 180 N/A N/A Critical Outdoor ambient temperature sensor malfunctioned. Check/replace sensor. Clears upon configuration or normal values.