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TROUBLESHOOTING
THE OPERATIONS MUST BE CARRIED OUT BY TECHNICAL QUALIFIED PERSONNEL HAVING THE REQUISITES
UNDER LAW REQUISITES AND IN CONFORMITY WITH THE SAFETY REGULATIONS IN FORCE.
THE INTERVENTIONS WITHIN THE WARRANTY PERIOD WILL BE CARRIED OUT BY AUTHORIZED SERVICE
CENTERS.
BEFORE RESETTING AN ALARM, IDENTIFY AND ELIMINATE ITS CAUSE.
REPEATED RESETS MAY CAUSE SERIOUS DAMAGES.
In certain machine configurations, some safeties may be placed in series and lead back to a single input on the electronic
module.
Therefore, check on the electrical diagram whether the device to which the alarm corresponds has other devices or
safeties connected in series.
Below is a list of the possible causes of alarms.
HIGH PRESSURE cooling
1. high air temperature (see operating limits)
2. not CONSTANT flow (for example, if the pumps are
turned off, certain areas of the plant are excluded or
included, other uses are isolated, etc)
3. insufficient air flow to coil (high thermal difference
between input and output)
4. air filter dirty
5. fans do not work, direction of rotation inverted
6. Manostat/transducer: loose electric
contacts/terminals, wiring cables interrupted
7. refrigerant circuit empty, visible leaks of
refrigerant/oil, insufficient charge
8. dryer filter clogged
9. thermostatic device not operating correctly
10. Check the trigger point for the manostat and
transducer
11. Check the manostat or transducer pressure control
point (deposits of oil, dirt, pin blocked mechanically)
LOW PRESSURE cooling
1. low air temperature (see operating limits)
2. not CONSTANT flow (for example, if the pumps are
turned off, certain areas of the plant are excluded or
included, other uses are isolated, etc)
3. insufficient air flow to coil (high thermal difference
between input and output)
4. air filter dirty
5. fans do not work, direction of rotation inverted
6. Manostat/transducer: loose electric
contacts/terminals, wiring cables interrupted
7. refrigerant circuit empty, visible leaks of refrigerant/oil,
insufficient charge
8. dryer filter clogged
9. thermostatic device not operating correctly
10. Check the trigger point for the manostat and
transducer
11. Check the manostat or transducer pressure control
point (deposits of oil, dirt, pin blocked mechanically)
COMPRESSOR PROTECTION
1. Identify the part on the wiring diagram
2. Loose electric contacts/terminals, leads broken
3. electrical windings interrupted
4. Vacuum power voltage below the limits
5. power contactors / contacts defective
6. start-up power voltage lower than the limits
7. electrical absorption high / unbalanced
8. High compressor discharge temperature >
thermostatic device needs calibrating, insufficient
refrigerant charge
FAN PROTECTION
1. Identify the part on the wiring diagram
2. fan mechanically jammed, bearings / drive belt (if
present)
3. Loose electric contacts/terminals, leads broken
4. electrical windings of fan interrupted
5. power supply voltage below limits
6. electrical absorption high / unbalanced
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