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4 . F a u l t s , e r r o r s a n d t r o u b l e s h o o t i n g
4.1.
Description of fault messages and their causes
Fault
Description
Possible cause
Troubleshooting
The equipment
cannot be started
The equipment
remains idle even
after the required
performance level
was selected
Power supply is not connected
Connect the equipment to power
supply (switch on upstream
safety circuit breakers)
Not found
Disconnect from power
supply
and contact a service
technician
The equipment is
not supplying
enough air
The equipment is
providing a
significantly lower
volume of air
Blocked filter
Disconnect the equipment
from power supply
Replace the filter cloth or
cassette
If the equipment has been in
operation for more than approx.
4 years, clean the heat recovery
exchanger/s
A mechanical obstacle at fresh
air suction or supply air outlets
Check whether the suction
openings of fresh air or supply
air outlets are not mechanically
covered
Remove any obstacles
Visually and by listening check
whether the dampers open
properly
Not found
Disconnect from power
supply
and contact a service
technician
The equipment is
not heating or is
heating
insufficiently
When the heater
has been started,
supply air
continues to be
cold
The electric heater is not
connected to power supply
Connect the equipment to power
supply (switch on upstream
safety circuit breakers) – can
only be done by an authorized
person
Response of the electric
heater’s heat protection
Wait to see if the fault does not
sort itself out after approx. 1
hour
Low maximum capacity of the
heater
Does not constitute a fault
(insufficient capacity designed)
Not found
Disconnect from power
supply
and contact a service
technician
Water is dripping
from the
equipment
Water droplets
form between the
door and body of
the equipment
during operation
The condensate drain siphon is
insufficiently flooded
Disconnect the equipment
from power supply
and flood
the condensate drain siphon
The condensate drain is blocked
with dirt
Disconnect the equipment
from power supply
and clean
the condensate drain including
the siphon
The seal groove is damaged
(the fault can be accompanied
by a whistling sound caused by
air flowing through the gap)
Disconnect the equipment
from power supply
and replace
the seal
Water droplets
form at the
condensate drain
connection point
The condensate drain seal or
line is damaged
Disconnect the equipment
from power supply and
re-seal
the condensate drain
Not found
Disconnect from power
supply
and contact a service
technician
Summary of Contents for DUPLEX 250 Easy
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