38
PROBLEM CAUSE ACTION
The unit does not start after
the last start.
* Disconnected supply.
* Main switch set to STOP.
* No water flow.
* Fuses are broken.
* Low electrical supply.
* One of the safety devices has
been activated.
* Compressor fault.
* Low water temperature.
* Check electrical supply.
* Connect main switch.
* Start water pump (and check air in
system).
* Check voltage.
* Check antifreeze thermostat.
* Check high/low pressure switch.
* Change compressor.
* Create demand for cooling.
The fan does not work
(although the compressor is
operating).
* Internal safety device open.
* Bad connection.
* Poor condensation control.
* Let the motor cool.
* Connect properly.
* Check operation.
The compressor stops when
the high pressure switch is cut
off.
* Condenser coil blocked.
* Unit operating outside of limiting.
* Abnormal operation of the fans.
* Maintain condenser coil.
* Check the ventilators.
The compressor stops when
the low pressure switch is cut
off.
* Insufficient charge.
* The water exchanger is blocked
(water side).
* No water flow.
* Check the charge.
* Maintain the exchanger.
* Check that there is sufficient water flow.
The oil level in the compressor
is very low.
* The crank case heater is not
working.
* Replace the crank case heater and
check oil level.
High noise level of compressor
and high and low pressures are
abnormal.
* Phase connection for
compressor power supply
incorrectly.
* Switch the wires between
two of the phases of
compressor power supply.
4.3.- FAILURE DIAGNOSIS
4.- MAINTENANCE
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