Blueair BLMI-500AD Service Manual
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Blueair BLMI-500AD Service Manual

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SERVICE MANUAL
BLMI-500AD
VER200626

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Chris Franchi
July 13, 2025

I’m trying to run the cleaning cycle and have only been able to get the “C” display to come up. Is that going to clean the system?

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Summary of Contents for Blueair BLMI-500AD

  • Page 1 SERVICE MANUAL BLMI-500AD VER200626...

  • Page 2: Table Of Contents

    Contents General information 1.1 For your safety 1.2 Warranty 1.3 How to read model names and serial numbers 1.4 Installation 1.5 Water supply and drain pipe connection 1.6 Assembly structure 1.7 Specifications Technical information 2.1 Water and refrigeration system 2.2 Operation 2.3 Control board Troubleshooting 3.1 Parts operation check...

  • Page 3: General Information

    General information 1.1 For your safety WARNING - The ice machine must be installed in accordance with individual State/Regional Codes and regulations. - Read the manual thoroughly before installation. Improper installation may void or limit warranty coverage. Most Importantly, Improper installation may damage the unit and could cause serious injury.

  • Page 4: How To Read Model Names And Serial Numbers

    1.3 How to read model names and serial numbers BLMI-500AD A: Air-cooled W: Water-cooled B: Blue Air (on US model # only) D: Dispenser L: Lassele (Our brand in S. Korea) M-Modular ndercounter I: Crescent shaped ice Daily ice Production in LBS.

  • Page 5: Installation

    1.4 Installation 1.4.1 Suggested Installation requirements Indoors with good ventilation. No heaters or hot side equipment around the machine. Do not place in direct sunlight.. Absolutely requires a sufficient water supply, well equipped drainage system, and close proximity to power outlet. Ice machine should not have any obstructions near the machine to promote and maintain proper air flow and optimum ice production.

  • Page 6: Water Supply And Drain Pipe Connection

    Copper pipe - Minimum ID 1/4” 1.5 Water supply and drain pipe connection Shut-Off valve Water supply inlet -3/8” FPT Drain valve valve CCVVCD Drain outlet -3/4” FPT Vent tube Hard pipe - Minimum ID 3/4” Bin drain outlet- 3/4” FPT Floor drain “...

  • Page 7: Assembly Structure

    1.6 Assembly structure BLMI-500AD Cleaning Valve Spray Tubes Hot gas Valve Evaporator Condenser Water inlet Valve Fan Motor Drain Valve Compressor Drier Water Pump Level Sensor Water Valve Control box Bin control...

  • Page 8: Specifications

    1.7 Specification Content 500AD REMARKS AC Supply voltage 115V/60Hz AT90℉/WT70 Amperage & ℉ 14A /1100W power consumption AT32℃ /WT21℃ Maximum Fuse Circuit Breaker 30" * 24" * 20" [inch] Product size (W*D*H) 762 * 610 * 560 [mm] Weight 126 lbs. (57 kg) Per Cycle 9.18 lbs.

  • Page 9: Technical Information

    Technical information 2.1 Water and refrigerant system Refrigerant Circuit Water Circuit...

  • Page 10: Operation

    2.2 Operation During freezing and harvesting cycle...
  • Page 11 During ice storage bin is full...
  • Page 12 Sequence ⚫ Stand-by Once the ice machine is connected to the main power suppy, it shows model name and PCB (control board) version and stand-by for operation. ⚫ Water supply As soon as the power is turned on, the ice machine will immediately begin the water supply cycle.
  • Page 13 Harvest LED light turns to Green. “2.xx” is displayed during harvest cycle. [.xx = Elapsed time (x 1 minute)] Example: The display reads: 2.03 during the harvest cycle. The first number (2) indicates that the ice machine is in the Harvest cycle. The second number (03) indicates that the machine has been in harvest for 3 minutes.

  • Page 14: Control Board

    2.3 Control board 2.3.1 CN 10 Liquid V/V Cleaning V/V RLY 8 Drain V/V Water Pump(C.C.W) RLY 7 RLY 6 RLY 9 Bin Sensor Water V/V Float Switch Fan Motor RLY 5 Evaporator Sensor Hat Gas V/V Water Pump(C.W) RLY 4 RLY 3 Control PCB RLY 2...
  • Page 15 2.32 Display control board Status LED lamp Display Buttons 2.3.1.1 Features ⚫ 7-segment Display Meaning 1 = Water supply cycle .xx = Elapsed time (x 10 seconds) Ex) 1.02 = In water supply cycle for 20 seconds. 2 = Harvest cycle .xx = Elapsed time (x 1 minute) Ex) 2.02 = In harvest cycle for 20 seconds.
  • Page 16 Error codes : Below error codes will be displayed so technicians can immediately identify ⚫ specific malfunctions. Display Meaning Freezing cycle exceeds 60 minutes twice in a row. Harvest cycle exceeds 25 minutes twice in a row. Evaporator sensor temperature is over 60℃(140℉). Water is not drained during full storage.
  • Page 17 E5 : 1) For the first ice making cycle: If the float switch does not sense enough water at the end of the first water supply cycle, the ice machine will go back to the water supply cycle again before advancing to the harvest cycle. E5 will be displayed If the float switch continues to sense insufficient water levels during subsequent supply cycles.
  • Page 18 Wash : For cleaning and sanitizing the ice machine. Check : Allows the user to check the status of different operations of the machine. ⚫ Combination Power + Wash : Pressing and holding these buttons will force the machine into the harvest cycle.
  • Page 19 2.3.2 Parameter setting 2.3.2.1 Instruction - How to change the setting Number Display Direction Press check button for 5 seconds to change parameter setting. P-1 will be displayed. Press check button again to adjust P-1 setting result. The setting can be adjusted up or down by pressing power or wash buttons.
  • Page 20 2.3.2.2 Parameter code meaning Number Display Features Range Adjustable value Set evaporator temperature for 5 ~ 30℃ 1℃, 1℉ harvest control 41 ~ 86℉ Set harvest delay time when 60 ~ 300 5 sec ambient temperature is high. Set harvest delay time when 60 ~ 300 5 sec ambient temperature is low.
  • Page 21 P-1 / Set evaporator temperature for harvest control: Once evaporator sensor reaches the set temperature, harvest cycle will be done. [Default Setting : 7℃(44.6 ℉)] P-2 / Set harvest delay time HI: Set harvest delay time after evaporator sensor reaches a set temperature[Default : 7℃(44.6℉)] use this adjustment when ambient temperature is high.

  • Page 22: Troubleshooting

    3 Troubleshooting 3.1 Parts operation check 3.1.1 Test mode 1) How to get in test mode to check parts’ operation Display Control Board Direction To turn off the machine: Press and hold the power button for 5 seconds. Press and hold wash button for 5 seconds to activate test mode.
  • Page 23 2) Test code meaning Number Display Function Remarks Compressor On Fan motor On Water valve On Pump motor C.W On (Circulation) Pump motor C.C.W On (Drainage) Hot gas valve On Fan motor On Water valve On Cleaning valve On Water valve On Drain On Water valve on Cleaning valve on...
  • Page 24 3.1.2 Sensor operation check 1) Bin switch sensor Flap Can be checked while the machine is in operation. (Water supply, Freezing, or Harvesting Cycles.) Press and hold down the plate flap on bin switch. [ FUll ] will be displayed after 10 seconds if the bin switch properly works. [ FUll ] will disappear within 5 seconds after releasing the plate flap.
  • Page 25 2) Water level sensor Float Can be checked while the machine is in operation. (Water supply, Freezing, or Harvesting Cycle.) Lift the float switch to its highest level, and then proceed to slowly push the float switch all the way down to the lowest position. The display will show a green light to indicate the float is at the lowest position.
  • Page 26 3.2 Main PCB program update ⚫ The PCB program may be easily updated by using EPGM. Reset pin Writing pin Reset pin connector Button To reset the PCB, Turn off the ice machine. Disconnect the machine from the main power source Connect EPGM to main power.

  • Page 27: Error Codes

    3.3 Error codes 3.3.1 E1 / Freezing cycle exceeds 60 minutes. Freezing cycle exceeds 60 mins there refrigerant in the machine? Check for leak points, Has ice been repair and recharge produced? refrigerant. Replace necessary Are parts in proper parts. operation? (Fan, pump, compressor) Refrigerant pipe...
  • Page 28 3.3.2 E2 / Harvest cycle exceeds 25 minutes. Harvest cycle exceeds 25 mins Insulate evaporator Is the actual temperature of Is the evaporator sensor the evaporator sensor over properly insulated? sensor 7℃(44.6℉)? Proceed with evaporator sensor temperature correction (P-4) Check for leaks, repair, and Is refrigerant in recharge refrigerant.
  • Page 29 3.3.3 E3 / Evaporator sensor temperature is over 60℃(140℉) Evaporator temperature sensor is over 60℃(140℉) Are the environmental conditions within specification? Change installation place Does the temperature sensor reading and the actual temperature match? Replace sensor Insulate evaporator sensor...
  • Page 30 3.3.4 E4 / Water is not drained during full storage. Water is not sufficiently drained within set drainage time [default: 480 seconds] when the ice storage bin is full. Connect the Is the drainage line inside of Is the water the ice machine properly drainage line drained?
  • Page 31 3.3.5 E5 / Water level sensor keeps catching low water level Water level sensor keeps catching low water level Check water supply Is water properly pipe and valve supplied? Adjust water Is supplied water pressure. pressure okay? Replace water level sensor 3.3.6 E6 / Evaporator sensor error Evaporator sensor error...
  • Page 32 3.3.7 E7 / Main PCB program error E7 is showing up Repalce main PCB 3.3.8 E8 / Ambient temperature error E8 is showing up Replace display controller 3.3.9 E9 / Bin switch error Bin switch error Is the sensor Connect sensor properly connected? Sensor is damaged...
  • Page 33 3.3.10 HI / Ambient temperature is over 45℃(113℉) HI is showing up Replace display controller Is the actual ambient temperature over 45℃? (113℉)? Check environmental condition and change installation place if necessary 3.3.11 LO / Ambient temperature is lower than 5℃(41℉) LO is showing up Check environmental condition and change installation place if necessary...

  • Page 34: Problems And Resolutions

    3.4 Problems and resolution 3.4.1 Ices are too small Ices are too small Replace(reassemble) Is water level sensor water level sensor properly assembled? or clean it Re-assemble Is water drained overflow pipe during freezing cycle? Adjust water Is supplied water pressure okay? pressure.
  • Page 35 3.4.2 Evapoartor gets frozen Evaporator gets frozen Change installation Is ambient place temperature okay? Is drainage line Check drainage line outside of the ice machine properly (Air vent installation and hose size) assembled? 1. Replace main PCB Is the PCB program 2.
  • Page 36 3.4.3 Cannot turn on the ice machine Cannot turn on the ice machine Check power source Does main power and circuit breaker supply work? Does fuse Change fuse properly work? Is harness properly Connect harness connected? Change voltage Does voltage transformer transformer work? Replace main PCB...

  • Page 37: Circuit Diagrams And Technical Data

    4 Circuit diagrams and technical data 4.1 Circuit diagrams 4.1.1 BLMI-500AD (115V/60Hz)

  • Page 38: Performance Data

    4.2 Performance data 4.2.1 BLMI-500AD (115V/60Hz) Ambient Water temp(ºF/ºC) content Temp 50ºF/10ºC 70ºF/21ºC 90ºF/32ºC (ºF/ºC) 1010 70/21 Approximate electric 1053 1107 80/27 consumption 1054 1075 1097 90/32 [W] (Stable after 5 min) 1125 1035 1148 1045 1203 1050 100/38 70/21 10.1...
  • Page 39 Ambient Water temp(ºF/ºC) content Temp 50ºF/10ºC 70ºF/21ºC 90ºF/32ºC (ºF/ºC) 312.9 22.0 344.9 24.3 369.1 26.0 70/21 362.0 25.5 394.0 27.7 414.6 29.2 80/27 after 5min 406.1 28.6 416.4 29.3 426.7 30.0 90/32 High pressure in 449.5 31.6 458.0 32.2 475.1 33.4 100/38 freezing...

  • Page 40: Evaporator Sensor Data

    4.3 Evaporator sensor data Temp' Resistance Temp' Resistance Temp' Resistance Temp' Resistance (℃) (㏀) (℃) (㏀) (℃) (㏀) (℃) (㏀) 87.8 13.29 2.97 0.886 83.3 12.75 2.87 0.862 79.0 12.23 2.78 0.839 75.0 11.73 2.69 0.817 71.2 11.26 2.60 0.795 67.6 10.81 2.52...

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