MultiMAXX HE
Servicing and Maintenance
FläktGroup DC-2011-0142-GB 2018-05/R5 • Subject to modifications
37
7.5
Operating faults
* repeated activation after troubleshooting
* First set the speed selection switch to "0" position, then change to the required speed.
If the malfunction cannot be eliminated by the maintenance personnel, please consult
our authorized service department.
Symptom
Possible cause
Action/remedy
Fan is not rotating
Signal LED does not light up
Unit not switched on
Switch on unit
No mains voltage
Check fuse/circuit breaker/power supply
(technical personnel only)
Electric lines not connected
Connect electrical cables
(technical personnel only)
Faulty unit fuses
Replace fuses
(technical personnel only)
Controller deactivates fan after room tem-
perature is reached
Use room thermostat to increase setpoint.
Fan is not rotating,
signal LED (error) lights up
Motor protection tripped
Check motor temperature, let the motor
cool down and activate again*
Investigate reason for overheating if the
problem persists
Fan running but air volume too low
Air volume
Air flow blocked or restricted,
Filter or heat exchanger dirty.
Ensure free air passage
Wrong rotation direction of fan
Change rotating direction of fan
Unit too noisy
Air intake or discharge areas blocked
versperrt
Clear discharge/air intake of obstructions
or bends
Verengungen und Umlenkungen
Noisy fan bearings
Replace faulty fan
(technical personnel only)
Filter is dirty
Replace filter
Unit does not heat/heats insufficiently
Fan fails to start
See above
Air flow rate of unit too low
Air intake or discharge areas blocked
versperrt
Air intake or discharge areas blocked
versperrt
Clear or clean ducts
Fan blocked/faulty
Check fan, replace if necessary
(technical personnel only)
Filter is dirty
Replace filter
No mains voltage
Check fuse/circuit breaker/power supply
(technical personnel only)
Automatic over-temperature thermostat
deactivated the heater bank
hat das Heizregister abgeschaltet
Let the heater bank cool down - then it will
be activated automatically.
Automatic over-temperature thermostat
did not activate the heater bank after cool-
ing down period
Check over-temperature thermostat and
replace if required.(
technical personnel
only
)
Manual over-temperature thermostat de-
activated the heater bank
Let the heater bank cool down, in cool
state investigate the reason. Press „reset“
after performing troubleshooting.
Setpoint temperature on room thermostat
too low
Use room thermostat to increase setpoint
temperature
Room thermostat is located above a heat
source or exposed to direct sunshine
Locate room thermostat in proper position
(technical personnel only)
Faulty electric heater bank
Replace electric heater
(only technical staff)
Controller switches on continuously
Control panel or sensor fitted in the wrong
location (e.g. adjacent to open door or
window or close to MultiMAXX outlet)
Fit control panel or sensor in proper
location where room temperature can be
measured representatively
(technical personnel only)
