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STÖRUNGEN UND ABHILFEN
Malfunction
Fan does not run
Fan coil unit not switched on
No power
Cabling not connected
Low air flow from
Low fan speed
fan-coil unit
Air ducting obstructed
Filter dirty
Fan-coil unit noisy
Hight fan speed
Low air discharge temperature
Air discharge system obstructed
Fan bearing defect
Filter dirty
Fan-coil unit
Fan not switched on
does not heat
Heating fluid not hot
(sufficiently)
Low water flow rate
Low setpoint temperature
Controller or sensor positioned near heat source
Filter dirty
Fan-coil unit
Fan not switched on
does not cool
Cooling fluid not cold
(sufficiently)
Low water flow rate
High setpoint temperature
Control located in cold air (e.g. near door)
Filter dirty
Fan-coil unit leaks
Condensate tray dirty
in the cooling
Cold water lines not insulated
mode
Unit not suspended horizontally
Condensate drain plugged
Condensation on air register
Room temperature
The control located at wrong place (e.g. at doors or in
fluctuates
the airdischarge area)
High heating fluid temperature
Independently controlled units connected to same
water line (e.g. radiators with thermostatic valves)
Possible causes
Corrective action
Switch on fan-coil unit
Check fusing/mains power
Connect cabling (qualified person only)
Select higher fan speed
Clear air ducting, for unrestricted air flow
Replace or clean filter
Select lower fan speed
Increase temperature setting of control
Clear air discharge system
Call field service
Replace or clean filter
Switch on fan
Switch on boiler
Switch on recirculation pump
Vent heating system
Check pump throughput
Check water distribution and reset pressure losses in different lines
Increase control setpoint temperature
Relocate the control
Replace or clean filter
Switch on fan
Switch on chiller
Switch on recirculation pump
Vent system
Check pump throughout
Check water distribution and reset pressure losses in different lines
Lower control setpoint temperature
Relocate the control
Replace or clean filter
Clean condensate tray
Insulate cold water lines
Realign unit and suspend unit horizontally
Check condensate drain for sufficient slope, clean and refill trap
Increase water flow temperature
Increase angle between air register stats and ceiling
Use coated air register
Increase fan speed
Relocate control to place where room temperature is representative (remote
from fan-coil unit)
Add or reset maximum and minimum supply air temperature sensors
Reset boiler control
Split water supply; if impossible use flow control valves on other units and
increase system pressure
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