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Maintenance
Fault table
9.1 Fault Table
Only permit authorised personnel to rectify operational faults.
The table below shows possible faults and the action needed to
rectify them.
Fault Possible cause Actions
Personnel
Fan is not running
Unit switched off Switch on the unit by the control
Qualiedpersonnel
No power supply Check power supply and connect
Electrical cable not connected or
incorrectly connected
Check electrical wiring and correct if
necessary
No demand by controller, therefore
fans switch off
Change controller settings, if
required
Unit too loud
Speed too high Set lower fan speed
User/Caretaker
Air intake or air outlet openings
blocked
Free air intake and outlet grilles
Filter dirty Replacelter
Unit not heating
and cooling
sufciently
(LPHW/CHW)
Fan not switched on Switch on fan at controller
User/Caretaker
Air volume too low Set higher fan speed
Filter dirty Replacelter
No heating or cooling medium
Switch on heating and/or cooling
system, switch on circulation pump,
vent unit(s)/system
Qualiedpersonnel
Valves do not work Replace faulty valves
Water volume too low Check pump output, check hydraulics
Setpoint temperature on controller
set too low/high
Adjust temperature setting on
controller
Control unit with integrated sensor
and/or external sensor is exposed to
direct sunlight or positioned over a
heat source
Position control unit with integrated
sensor and/or external sensor in a
suitable location
Water escaping
from unit
Condensate drain not properly
installed
Check correct operation of
condensate pump, check and
cleancondensatedrain(iftted)
Qualiedpersonnel
Chilled water line incorrectly
insulated
Check insulation
Condensate drain outlets blocked
Clean condensate drains and check
for adequate gradient
Hydraulic connection not properly
done
Checkowandreturnandtighten,
if necessary
Condensate pump
is not running
properly
See separate instructions for the condensate pump
Qualiedpersonnel