repeat if necessary. When normal operation has been restored (Chapter 4.3) screw the safety cap as far as itwill go using pliers, after checking that the internal gasket is in good condition. 6.2.1.3 – AIR IN THE CONDENSER This problem will not occur in a new system. It can happen to a system in which at least one part has beenexposed to air for a long time (more than 15’) without a coupling. The air can only be removed with a vacuum pump for boat. This requires the help of an authorized Frigoboat service technician. 6.2.1.4 – DEFECTIVE HIGH PRESSURE SWITCH (HP) If you are sure that the problem has not been caused by any of the situations in 6.3.1.1 - 6.3.1.2 - 6.3.1.3, if thehigh pressure switch (HP) continues to operate, detach the compressor to short-circuit the wires starting from the pressure switch. If the compressor works normally, it means that the pressure gauge is faulty and must be replaced. 6.2.2 – LOW PRESSURE SWITCH (LP) ALARM The system is also protected by a low pressure switch, which stops the compressor from working with an emptysystem. Only remove it when the pressure under -.02 Bar. This alarm may be triggered if: 6.2.2.1- EXPANSION VALVE IS LOCKED SHUT If the expansion valve is locked shut due to humidity or a defect, the low pressure part of the system will drop toa pressure lower than -.02 bar. A fault in the thermostatic valve is very rare. If the cause is humidity, you need to replace the dehydrator filter. 6.2.2.2- INSUFFICIENT COOLANT If the system loses the original coolant, the low pressure part of the circuit falls to negative values and thesystems is stopped by the low pressure switch (LP). The loss of coolant must be identified and repaired and then the system must be refilled. Every time you refill, we recommend that you replace the dehydrator filter. 6.2.2.3 – DEFECTIVE LOW PRESSURE SWITCH (LP) If you are sure that the problem is not caused by any of the situations in 6.3.2.1 - 6.3.2.2, if the low pressureswitch (LP) continues to operate, detach the compressor to short-circuit the wires that start from the pressure switch. If the compressor works normally, it means that the pressure switch is faulty and must be replaced. 6.3 – ONE OR BOTH COMPRESSORS NOT WORKING BUT SEAWATER PUMP WORKING NORMALLY In this case, one of two things may have occurred:1) One or both compressors are damaged 2) The compressor electronics have recorded an anomaly and have stopped the relative compressor. In both cases, to understand the exact cause of the problem, insert a 10mA LED on the compressorelectronics as described in diagram 6.2.1 and refer to table 6.2.2 to identify the fault.

+ -

+ F D C P T LED + - FAN

Diagram 6.2.1 13