66
EN
i-ACCURATE i-AX - i-AW - i-AD - i-AT - i-AF
FAULT
CAUSE
SOLUTION
See “LOW OR NO AIR FLOW”.
Insufficient air flow-rate
Check the continuity of the connection from
the safety thermostat to the control system.
Thermostat connection wire cut or broken
Replace the heater safety thermostat.
Faulty thermostat
HEATER SAFETY
THERMOSTAT
ACTIVATED
Empty and recharge the circuit.
A) Air or incondensable gas in the refrigerant
circuit, seen by the presence of bubbles, despite
measuring a high subcooling.
Check the operation and the correct direction
of rotation of the fans on the outdoor heat
exchanger.
Check that the exchanger is not dirty and
remove any material that may be blocking it
(leaves, paper, seeds, dust, etc.) with a jet of
compressed air or with a brush;
Check the outdoor unit for any obstacles to
the flow of air and any recirculation of the cool-
ing air;
Check that the temperature of the cooling air
does not exceed the design value.
B) Insufficient air flow-rate to the remote heat
exchanger or air too hot
Check the flow-rate, the pressure and the
temperature of the cooling water in the
closed circuit;
Check the calibration and the operation of the
pressure control valve.
Insufficient water flow-rate to the condenser
or water too hot.
Remove refrigerant from the circuit.
Excessive refrigerant charge; condenser
partially flooded. Excessive subcooling of the
liquid at the condenser outlet.
Check the opening of the valves.
Valves on the high pressure side of the circuit
partially closed.
HIGH COMPRESSOR
DISCHARGE
PRESSURE
Check the operation of the condenser fans
and the corresponding protection device;
repair or replace the faulty fans;
Check the calibration and the operation of the
remote condenser fan pressure switch or the
speed controller.
(See CONTROLLING THE CONDENSING
PRESSURE)
The condensing pressure control system
isn't working.
See “HIGH COMPRESSOR DISCHARGE
PRESSURE”.
The system is affected by an excessive
discharge pressure
HIGH PRESSURE
SWITCH ACTIVATED
(high compressor dis-
charge pressure)
