23
1 0 . F a i l u r e s a n d t r o u b l e s h o o t i n g
Failure
Symptoms
Possible causes
Troubleshooting
Appliance will not
start up
Power supply is not connected
Connect to power supply (switch on
primary circuit breakers)
Power supply or interconnecting
electric cables are interrupted
Disconnect from power supply and
contact a service technician
Not found
Disconnect from power supply and
contact a service technician
Appliance supplies
insufficient air
volume
The appliance supplies
considerably lower air
volumes
Clogged air filters
Switch off the appliance
Disconnect from power supply
Replace air filters
Mechanical obstruction in fresh
air intake or supply air outlets
Look for mechanical obstructions of
fresh air inlet ports
Look for mechanical obstructions of
supply air outlets
Remove obstructions, if any
Not found
Disconnect from power supply and
contact a service technician
Appliance does not
heat at all or heats
insufficiently
Cool air is supplied
continuously
Air in hot water heater
Check heating water temperature
Bleed air
Heating water temperature in the
hot water heater too low
Check heating water temperature
Heating water flow rate too low
Check the condition of the sludge filter
on the heating water inlet; clean the
filter
Maximum heater capacity too low
No failure (incorrect design capacity
too low)
Not found
Disconnect from power supply and
contact a service technician
Appliance does not
cool at all or cools
insufficiently
Warm air is supplied
continuously
Air in water chiller
(only in CHW version)
Air bleed the water chiller
Cooling water temperature too
low (only in CHW version)
Check cooling water temperature
Cooling water flow rate too low
(only in CHW version)
Check the condition of the sludge filter
on the cooling water inlet; clean the
filter
Condensation unit is not running
(only in CHF version)
Switch on the condensation unit
Maximum chiller capacity too low
No failure (incorrect design capacity
too low)
Not found
Disconnect from power supply and
contact a service technician
Water dripping from
appliance
Drops of water form
between the door and
frame of the appliance
during operation
Condensate drain siphon trap is
insufficiently filled with water
Disconnect from power supply and fill
the condensate drain siphon trap with
water
Condensate drain is blocked
Disconnect from power supply and
clean the condensate drain including
the siphon trap and pipes
Damaged door seal
(the symptoms might include a
whistling sound caused by air
flowing through the gap)
Disconnect from power supply and
check the condition of the door seal
If serious damage is discovered,
contact a service technician
Water drops from at the
condensate drain
connection point
Condensate drain seal or pipes
damaged
Disconnect from power supply and
contact a service technician
Not found
Disconnect from power supply and
contact a service technician
If the unit is disconnected from the electricity supply, follow the instructions given in chapter 2.2
Operational safety.
For further description of possible problems and troubleshooting contact your supplier of the
control and measurement system.
