Dantherm AC-24, Service Manual

Page: 43 / 52

Fault finding,
continued
Problem

Cause

Action

Condenser or evaporator fan
does not operate.
Green and red thermo relay
indicator lamp are on
Fan thermo relay has cut off Press the reset button for
the evaporator or condenser
fan on the control panel (see
section “Reset of thermo",
page 28)
WARNING Do not try to restart the compressor several times within a short period. This will overheat
and may damage the compressor. The internal compressor thermostatic protection may
also cut out.
High ambient
temperature
If the surrounding temperature is higher than the max working temperature: 55 °C, the
condenser will not be cooled enough, resulting in too high pressure in the cooling circuit and
thereby operating the pressure switch (HP). Allow some time for cooling of the system.
Low ambient
temperature
If the air conditioner is operating below 20 °C the humidity in the airflow can form ice in
the evaporator coil. As the ice is insulating, the pressure in the cooling circuit will decrease
until the pressure switch (LP) operates. In this case the mode selector should be turned to
ventilation-only so that the evaporator coil can be defrosted by the airflow.
Reduced airflow A reduced airflow can be caused by dirty filters or sharp kinks in the air hoses etc.
This can result in activation of the pressure switch (LP). Check the unit.
Error code
thermostat controller
Error code
E29
in the thermostat controller display indicates
Air temperature (Sair) sensor error.
(Temperature sensor malfunction or loose connection.)
Fault finding guide, continued
43
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