Lennox Error Code UP

Original PDF page 116 MINI-SPLITS ERROR CODES 100227 “UP” on CONDENSER DISPLAY 3/2026 Revision Date: 2/14/2025 Subject: “UP” on Condenser Display Models: VRF, WATER, MMPD, MMLD Single Zone VRF and WATER Auto Trial Operation “UP”: 1. Normal operation will be prohibited if the Auto Trial Operation is not completed. NOTE: When the auto trial operation is not completed, UP (Unprepared) will appear on the segment display after the communication check and restrict the compressor from operating. (UP Mode will be cleared automatically when auto trial mode is completed.) 2. To start the Auto Trial, Press and hold K1 one time as shown in Table 1 below: NOTE: Auto Trial operation may take 20 minutes to a maximum of 2 hours depending on the operation status. Table 1: Setting key operation and checking the view mode with tact switch K1 Control Key Operation Display On Segment Press and hold 1 time Auto trial operation “K” “K” “BLANK” “BLANK” 3. Failure of Auto Check: An error code (Ex. E190) blinks on the display. Resolve the error by referring to the details on the troubleshooting table in the installation manual about how to troubleshoot for each error code and then perform the Auto Check again. 116 Original PDF page 117 MINI-SPLITS ERROR CODES “UP” on CONDENSER DISPLAY 100227 3/2026 MMPD, MMLD Single Zone Auto Check Operation “UP”: Table 1: Setting key operation and checking the view mode with tact switch This is a self-diagnosis function to determine the installation status and product integrity of the initial installation. This model requires the Auto Check to be implemented in the installation step before its normal operation is initiated. 1. Verify control connections and supply power to the unit, ensure service valves are fully open, and refrigerant charge is correct. 2. After applying power, wait for “UP” to be displayed indicating an auto check has not been performed. 3. Press the K2 button 7 times to initiate Auto- Check • During the Auto Check, the display will show “KE” BLANK” “BLANK”. • This will take 10 to 30 minutes to complete • Upon successful completion the display will show “PASS”. Display Key Push Type Mode SEG 1 SEG 2 SEG 3 SEG 4 1st Heating Test Mode K1 Short 2nd Defrost Mode 1) 3rd End Key Operation 1st Cooling Test Mode 2nd Inverter Check 3rd Pump Down 4th Not Used/No Function Inverter Fault K2 Short 5th Detection (Comp #1) 2) 6th Auto Trial Operation Auto Check 3) 7th (Installation Commission- ing Mode) 8th End Key Operation K3 Short 1st Reset Release Eco Mode 4. Press the K1 to place the system into standby mode for normal operation. PASS will disappear and 0000 will be displayed for normal operation/standby mode. 117 Original PDF page 118 MINI-SPLITS ERROR CODES “UP” on CONDENSER DISPLAY 100227 3/2026 These photos may not represent your exact system. 5. Failure of Auto Check: An error code (Ex. E190) blinks on the display. Resolve the error by referring to the details on the troubleshooting table in the installation manual about how to troubleshoot for each error code and then perform the Auto Check again. 118