AMT 12_00
23
U
U
N
N
I
I
T
T
W
W
O
O
R
R
K
K
S
S
B
B
U
U
T
T
D
D
O
O
E
E
S
S
N
N
O
O
T
T
D
D
E
E
H
H
U
U
M
M
I
I
D
D
I
I
F
F
Y
Y
O
O
R
R
I
I
N
N
A
A
D
D
E
E
Q
Q
U
U
A
A
T
T
E
E
Hygrostat set to normal value, not
defective and damp spots appear.
In cold weather, damp spots can form on the cold bridges. The hygrostat may
be turned down but this is not a good solution: the unit will work for too long. It is
recommended that the cold bridges be insulated.
Unit blows out warm air
Only the heating is working.
Check LED.
Blinking green LED
Defrost is connected: the fan turns and the compressor has stopped.
Await defrost delay (
±
10 min)
Filter and/or evaporator clogged with
dust.
Clean evaporator and/or filter.
If the filter is too dirty or worn, replace with a new one.
Unit blows out cold air
Leakage in the cooling circuit.
Evaporator freezes completely or
partially
Ambient temperature too low (lower than the minimum working range): higher
ambient temperature.
Defective expansion valve
Loss of refrigerant
.
O
O
T
T
H
H
E
E
R
R
F
F
A
A
I
I
L
L
U
U
R
R
E
E
S
S
Unit looses water.
Check that the unit is levelled and adjust if necessary.
The outlet should be laid running downward to the drain
Unit looses water and the drain is
clogged.
Obstruction either in de drain of the condensation tank or in the drain pipe:
unblock the drain.
If the drain runs to the outside, it can freeze. Defrost pipe and insulate with frost
protection tape.
Unit looses water and freezes.
Increase ambient temperature above 10°C or electrical defrost to be foreseen.
Unit switches in and out.
The hygrostat is affected by the outlet air.
The hygrostat and thermostat should be moved accordingly.
Unit makes noise.
Remove transport screws
The unit does not rest on all support points or is not levelled due to an
uneven floor. Check support points and fill up if necessary.
Unit is placed on or suspended from a resonating background or wall.
Move unit or fix differently.
