Service Assistant Search instructions:

Information can be searched:
- By Machine type or
- By free Text search or
- By Error codes (Alarms)
Text search searches for matching words.
=> Use the keyword (s) as short and precise as possible! Try different word formats.

After a successful search, hits and results matching the search will appear on the tabs !!
The results of the tabs can be scrolled with the scroll buttons at the top.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Oil pressure

Oil pressure alarm

Low oil pressure while the diesel engine is running

- Engine shut down.
- No restarting.
- Note!! The unit will Not start even with mains operation if the oil pressure shows ON for some reason (oil pressure switch broken/wire cut.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Zone1 evp. Fan

Zone 1 evaporator fan alarm

- Fuse F5 blown
- Zone 1 evaporator fan thermal relay or fuse has cut off power from the fans.
- Evaporator coil can be frozen.

- Zone 1 cooling and heating modes prevented
- Evaporator fan does not work, fan does not rotate
- If problem still exists, please contact to Lumikko service

L90, L5, L7, L7E, L7XE, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, MTE7

Zone2 evp. Fan

Zone 2 evaporator fan alarm

Zone 2 evaporator fan temperature relay has cut off power from fans

- Zone 2 cooling and heating modes prevented
- Evaporator fan does not work, fan does not rotate
- Reset thermal relay F21 from the multitemperature unit
- If problem exists, please contact to Lumikko service

L90, L300

Zone3 evp. Fan

Zone 3 evaporator fan alarm

Zone 3 evaporator fan temperature relay has cut off power from fans

- Zone 3 cooling and heating modes prevented
- Evaporator fan does not work, fan does not rotate
- If problem exists, please contact to Lumikko service

L400GS

Coolant Level

Diesel engine coolant level too low alarm

Coolant water sensor detects too low level of diesel engine coolant water.

- Engine shut down.
- Diesel engine overheats.
- No restarting.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

HP Alarm

High pressure alarm

- Too high pressure in the refrigerant circle.
- Before high pressure alarm four high pressure warnings has occured in 30 minutes.

- Cooling mode is prevented / not cooling.
- If problem exists, please contact to Lumikko service.

L90, L5, L7, L7E, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Zone1 overheat

Zone 1 overheat protection switch alarm

- Zone 1 eveporator coil temperature too high
- Zone 1 overheats

- Osaston 1. lämmitys- ja/tai sulatuspyyntö nollautuu.
- Osaston 1. lämmitys- ja/tai sulatuspyynti ei ole mahdollista.
- Osastoa 1. voidaan käyttää ylilämpösuojakytkimen palautumisen jälkeen normaalisti.
- Hälytyksen syy on paikallistettava mahdollisimman pian huoltopisteen toimesta.

Actions:
- Zone 1 is set to standby mode.
- Zone 1 heating and/or defrost mode is prevented.
- Zone 1 can be used normally when the overheat protection switch resets.
- Cause of the alarm must be solved as soon as possible at Lumikko service.

L90, L5, L7, L7E, L7XE, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Zone 2 overheat

Zone 2 evaporator coil alarm, temperature too high

- Zone 2 eveporator coil temperature too high
- Osasto 2. overheats

- Zone 2 is set to standby mode.
- Zone 2 heating and/or defrost modes is prevented.
- Zone 2 can be used normally when the overheat protection switch resets.
- Cause of the alarm must be solved as soon as possible in Lumikko service.

L90, L300

Zone3 overheat

Zone 3 overheat protection switch alarm

- Zone 3 eveporator coil temperature too high
- Zone 3. overheats

- Zone 3 is set to standby mode.
- Zone 3 heating and/or defrost mode is prevented.
- Zone 3 can be used normally when the overheat protection switch resets.
- Cause of the alarm must be solved as soon as possible in Lumikko service.

L5, L7, L7E, L7XE, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, L6H, L400GS, LT9, LT9Y, UMT6BHSK

Compressor Overheat

Compressor cylinder head temperature alarm.

- Fuse F5 blown
- Compressor cylinder head temperature is too high.
- Compressor overheats

- Compressor shuts down and restarts when temperature has dropped to nominal level.
- The unit can be used normally when the overheat protection switch resets.
- Cause of the alarm must be solved as soon as possible in Lumikko service.

L5

Condenser Fan

Condenser fan fuse alarm

Condenser fan fuse has cut off power.

- Condensing capability inefficient. May cause high pressure alarm.
Condenser fan not working, fan not rotates
- If problem exists, please contact Lumikko service.

L4BHS, L5BHS, L5BHSY, L5H, UMT6H, L6H

Evaporator Fans

Zone 1 evaporator fan alarm

Zone 1 evaporator fan fuse has cut off power from the fans

- Zone 1 cooling and heating modes prevented
- Zone 1 evaporator fan not working, fan does not rotate
- If problem still exists, please contact to Lumikko service

L5, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, UMT6BHSK

Gener. / comp. fault

Generator safety switch or Compressor thermal relay cut off alarm

Generator safety switch or compressor thermal relay has cut off power because of too high temperature.

- System will shut down.
- Generator not working, compressor not working.
- Restart the system.
- If problem exists, please contact Lumikko service.

L300, L90, L7, L7E, L7XE

Electric motor

Electric motor thermal relay cut off alarm

Electric motor thermal relay has cut off power because too high motor current.

- System will shut down.
- Electric motor does not work.
- Restart the system.
- If problem exists, please contact Lumikko service.

L400GS, LT9, LT9M, LT9Y

Gener. / comp. Fault

Generator safety switch or Compressor thermal relay cut off alarm

Generator safety switch or compressor thermal relay has cut off power because of too high temperature.

- System will shut down.
- Generator not working, compressor not working.
- Restart the system.
- If problem exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Engine overheat

Diesel engine overheat alarm

Diesel engine coolant temperature has passed over 115C. Engine will shut down. Restart possible after cooling down.

- System will shutdown.
- Diesel motor overheats, engine overheats
- No restarting.
- ATTENTION! Let the diesel engine to cool down before any actions.
- Check radiator fan
- Check coolant level.
- If problems exists, please contact Lumikko service.

L5H, UMT6H, L6H

Oil temp overheat

Hydraulic oil overheat alarm

- Hydraulic oil temperature has passed over 80C. Cooling and heating prevented.
- Resets automatically if temperature drops below 70C
-System will shut down in 85C.

- System will shutdown 85C.
- No restarting.
- If problems exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

AC Supply, AC-supply

Electric supply fault alarm

System does not detect power supply or it is missing in mains use or in diesel use electric motor/generator does not generate electricity.
Possible overvoltage or undervoltage in the production of electricity at diesel operation (related eg to motor revolutions or capacitors). System is not operational.

- In diesel use: System will shut down.
- In mains use: System will shut down. ATTENTION! When electricity is available again, system starts up.
- Unit does not work, does not cool, does not heat
- If parameter electricity auto start is set ON (Default is OFF), diesel engine will start up after one minute, after that external electricity is checked in 15 minute interval. Diesel engine is shut down after interval check detects that external electricity is available.
- If problem exists, please contact Lumikko service.

L5H, UMT6H, L6H

AC Supply, AC-supply

Electric supply fault alarm

- Occurs in mains operation if the temperature control does not detect the power supply.
- Occurs with hydraulic operation, if rpm is too high or low (normal about 2650).
- Problem can be related also to capacitors, operation/connections.
- Wrong hydraulic oil. Recommended hydraulic oil for the Nordic countries NESTE ARCTIC 28.

- System will shut down. ATTENTION! When electricity is available again, system starts up.
- Alarm is acknowledged when the electricity is restored.
- Unit does not work, does not cool, does not heat
- If problem exists, please contact Lumikko service.

L5, L7, L7E, L7XE, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Zone2 Defrost Fault

Zone 2 defrost malfunction alarm

Zone 2 evaporator maximum defrosting time has been exceeded. Defrost ending temperature is not reached or overheat protection switch has detected overheat during defrosting cycle.

- Defrost not working, not defrosting.
- System returns to cooling mode.
- Evaporator can still be frozen.
- Alarm is displayed.
- Alarm is cleared automatically after successful defrosting cycle.
- If problem exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

CAN-bus error

CAN bus communication error alarm

CAN-bus communication/connection failure between main control unit (MCU) and user panel (UP).

- System stays operational according to last settings.
- System can be shut down by switching the service switch from the electrical center to 0-position.
- Restart the system.
- If problem exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Zone 1 sensor

Zone 1 return air temperature sensor failure alarm

Zone 1 return air temperature sensor value is out of the measuring range. System will determ the return air temperature by using the defrost temperature sensor value.

- Cooling does not work, heating does not work
- System stays operational.
- Zone 1 temperature value is not accurate.
- If return air and defrost sensors are both in alarm state then system will set zone function to off.
- Cause of the alarm must be solved as soon as possible at Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Engine start times

Diesel engine alarm, maximum starting times exceeded.

Main control unit (MCU) has tried to start the diesel engine five times unsuccessfully.

- System shuts down.
- Diesel motor not starting, engine not starting.
- No restarting.
- If problem exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Zone 2 sensor

Zone 2 return air temperature sensor failure alarm

Zone 2 return air temperature sensor value is out of the measuring range. System will determ the return air temperature by using the defrost temperature sensor value.

- Cooling does not work, heating not working
- System stays operational.
- Zone 2 temperature valua is not accurate.
- If return air and defrost sensors are bot in alarm state then system will set zone function to off.

L7, L7E, L7XE

Condenser fan overheat alarm

Condenser fan overheat alarm

Condenser fan internal overheat protection switch has cut off power.

- Condenser fan does not work, condenser fan not working
- Condenser fan shuts down.
- Condensing capability inefficient.
- Fan continues to operate after cooling down.
- Please contact Lumikko service

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Zone1 defrost sensor

Zone 1 defrost temperature sensor failure alarm

Zone 1 defrost temperature sensor value is out of the measuring range.

- Defrost does not not work, defrost not working
- System stays operational.
- Zone 1 will defrost for 7 minutes if necessary.
- Please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Zone2 defrost sensor

Zone 2 defrost temperature sensor failure alarm

Zone 2 defrost temperature sensor value is out of the measuring range.

- Defrost does not not work, defrost not working
- System stays operational.
- Zone 2 will defrost for 7 minutes if necessary.
- Please contact Lumikko service.

L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

HP transmitter

High pressure transmitter alarm, (PS3) failure

High pressure transmitter value is out of the measuring range.

- Pressure transmitter problem, pressure transmitter does not work.
- System stays operational.
- Condenser fans will always operate at 100% power when the compressor is running.
- LP warnings and alarm may occur when operating in low ambient temperature.
- Cause of the alarm must be solved as soon as possible at Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Diesel temp sensor

Diesel engine coolant temperature sensor alarm, failure.

- Diesel engine coolant temperature sensor value is out of the measuring range.
- Diesel motor overheats, engine overheats

- System stays operational.
- Radiator fan operates continuously when diesel engine is running.
- Diesel engine is protected from overheating by a separate mechanical overheat switch.
- Main controller unit (MCU) uses preset parameter for glowing.
- Connection of the diesel engine temperature sensor may be weak. Can cause the unit to assume e.g. that the engine temperature is too cold. The engine is only idling and not raising rpm.
- Please contact Lumikko service.

L5H, UMT6H, L6H

Oil temp sensor

Hydraulic oil temperature sensor alarm, failure

Hydraulic oil temperature sensor value is out of the measuring range.

- System shuts down / not working.
- No restarting.
- Please contact Lumikko service.

L400GS

Generator temp sensor

Generator temperature sensor alarm, failure

Generator temperature sensor value is out of the measuring range.

- System shuts down.
- No restarting.
- Please contact Lumikko service.

L90, L5, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Supply air sensor

Evaporator supply air temperature sensor alarm, failure.

Evaporator supply air temperature sensor valua is out of measuring range. System stays operational.

- Systems will continue to operate if the temperature limit has not been reached.
- Please contact Lumikko service.

L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

Defrost failure alarm

Defrost failure alarm

Zone 1 defrost failure. Maximum defrost time has been reached.

- Defrosting does not work, evaporator freezes
- System returns to cooling mode.
- The evaporator may be frozen.
- The alarm is displayed
- The alarm is automatically reset after successful defrosting.
- Please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Running Signal

Diesel engine running signal alarm

No signal received from inductive rpm sensor.

- Diesel engine does not run, engine does not start
- System stays operational.
- Diesel engine is controlled by the oil pressure sensor.
- Please contact Lumikko service.

L5H, UMT6H, L6H

Running Signal

Hydraulic motor running signal alarm

No signal received from inductive rpm sensor.

ATT. Always shutdown refrigeration unit first before shutting down the Vehicle (hydraulic pump), otherwise this alarm can occur!

- System shuts down.
- Please contact Lumikko service.

L400GS

Radiator fan

Radiator fan alarm

Radiator fan thermal relay has cut off power.

- Diesel motor overheats, engine overheats
- System shuts down in diesel use.
- System stays operational in mains use.
- Reset thermal relay F17.
- If problem exists, please contact Lumikko service.

L5

Condenser fan

Condenser fan alarm

Condenser fan fuse has cut power.

- Condenser fan does not work, fan not working
- System stays operational.
- Condensing capability inefficient. May cause high pressure alarm.
- If problem exists, please contact Lumikko service.

L90, L7, L7E, L7XE

Condenser fan

Condenser fan thermal relay cut off alarm

Condenser fan temperature relay has cut off power from fan because of too high temperature.

- condenser fan does not work, fan not working.
- System stays operational.
- Condensing capabilities inefficient. May cause high pressure alarm.
- If problem exists, please contact Lumikko service.

L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, UMT6BHSK

Condenser fan

Condenser fan fuse alarm

Condenser fan fuse has cut power.

- Condenser fan does not work, fan not working.
- System stays operational.
- Condensing capability inefficient. May cause high pressure alarm.
- If problem exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Low battery volts

Low battery voltage alarm

Low battery voltage when starting up or running.

- Diesel engine does not start, engine not starting
- System stays operational.
- Start/stop function disabled for 60 minutes.
- Check alternator belt.
- Please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK, HeatMaster

Engine overheat

Diesel engine mechanical overheat alarm

Diesel engine mechanical overheat switch has detected too high coolant temperature

- Diesel motor overheats, engine overheats
- Diesel engine does not start, not starting
- System shuts down.
- No restarting.
- ATTENTION! Let the diesel engine to cool down before any actions.
- Check water pump's belt condition and tension.
- Restarting is possible when the coolant temperature has dropped.
- If problems exists, please contact Lumikko service.

L90, L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L300, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

LP alarm

Low pressure alarm

- Too low pressure in the refrigerant circle.
- Before low pressure alarm four low pressure warnings has occured in 30 minutes.
- Refrigerant leak, shaft seal leak.
- Wrong expansion valve adjustment in rear evaporator (MTE7, MTE8).

- Unit does not cool, not cooling
- Compressor shuts down.
- Possible leakage in the refrigeration circuit.
- Check the airflow of the evaporator coil if it's blocked/frozen.
- Shut down and restart the system.
- Please contact Lumikko service.

L4BHS, L5BHS, L5BHSY, L6BHS, L6BHSMT, L6BHSYMT, UMT, L400GS, UMT6BHSK

Generator overheat

High pressure warning alarm

- High pressure sensor has detected too high pressure in the refrigeration circuit.

- The generator does not work, denerator does not generate electricity.
- System shuts down.
- No restarting.
- If problem exists, please contact Lumikko service.

L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

HP warning

High pressure warning alarm

- High pressure sensor has detected too high pressure in the refrigeration circuit.
- When four high pressure warnings has occurred within 30 minutes, the system will shut down and a high pressure alarm is displayed.

- Lämmönsäätölaite ei jäähdytä, ei tee kylmää.
- Compressor shuts down.
- High pressure warning will automatically reset when the pressure drops.
- If problem exists, please contact Lumikko service.

L5, L7, L7E, L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, L400GS, LT9, LT9M, LT9Y, UMT6BHSK

LP warning

Low pressure warning alarm

- Low pressure transmitter has detected too low pressure in the refrigeration circuit.
- When four low pressure warnings has occurred within 30 minutes, the system will shut down and a low pressure alarm is displayed.

- Unit does not cool, not cooling
- Compressor shuts down.
- Possible leakage in the refrigeration circuit.
- Low pressure warning will automatically reset when the pressure rises.
- Check the airflow of the evaporator coil if it's blocked.
- Defrost manually if necessary.
- Shut down and restart the system.
- If problem exists, please contact Lumikko service.

L7XE, L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, UMT6BHSK

Heating resistors

Heating resistor fuse alarm

Heating resistors fuse has cut power.

- Heating does not work, not heating
- System stays operational.
- Heating and defrosting capability inefficient. May cause defrost failure alarm
- If problem exists, please contact Lumikko service.

L4BHS, L5BHS, L5BHSY, L5H, L6BHS, L6BHSMT, L6BHSYMT, UMT, UMT6H, L6H, UMT6BHSK

Suction line sensor

Suction line temperature sensor alarm, failure

Zone 1 suction line temperature sensor value is out of the measuring range. System will use fixed values for EEV control.

- System stays operational.
- Superheat value is not accurate.
- If SAT and RAT sensors are both in alarm state then system will set zone function to off.
- Cause of the alarm must be solved as soon as possible at Lumikko service.