H20 TEK D168H4-32C6EH-22-3 Manual Del Usuario página 42

Error
M) High indoor tem-
perature，high tem-
perature alarm
N) Low indoor humid-
ity
O) High indoor hu-
midity
P) Evaporator frosting
Q) Overheating com-
pressor
R) Compressor is too
cold and big noise
S) Insufficient air vol-
ume
T) Lack of refriger-
ating capacity
42
Possible Causes
no airflow circulation: fan
doesn't work
Slow airflow:the filter block-
ing;air supply is not suitable
for the room
It still work while heating re-
sistance value exceed set val-
ue: the temperature probe's
problem
Inhaled excess air in winter：
The room is not closed or hu-
midifier does not work
Inhaled excess air in summer:
the room is not closed.
Windage loss
System refrigerant liquid level
is low: air bubbles could see
from the liquid lens
Expansion valve is too tight,
and output side of evaporator
superheat is too big
Expansion valve is too loose,，
and output side of evaporator
superheat is too small
A foreign body between the
expansion valve and pipe di-
ameter, cause abnormal work
Return air filter or evaporator
are choked up with dirt,etc.
The fan or the motor is out of
order.
Lack of refrigerant
Too much refrigerant,too high
condensing pressure
insufficient air volume
openness
of the expansion valve is too
small or evaporating pressure
is too low
openness
of the expansion valve is too
big, cause insufficient cooling
capacity even liquid impact
Filter appearance knot dew or
frost
Compressor fault
Solutions
check fan protection
Clean or replace filter
check the air supply and return air
grille, increase the outlet
replace probe
Closed the door,close the
room.reduce new air quantity
Closed the door,close the room.
Less air
Check, ruled out, charge refriger-
ant leakage
Turn up openness
of the expansion valve, replace ex-
pansion valve
Turn down openness
of the expansion valve, replace ex-
pansion valve
clear expansion valve
Clear or replace
Check and rule out
Leak detection and ruled out,fill
refrigerant
Spare part of the refrigerant
Adjust the air flow
Adjust openness
of the expansion valve, replace ex-
pansion valve
Adjust openness
of the expansion valve, replace ex-
pansion valve
remove the filter to clean, replace
filter
Check,rule out