Omcan IC-CN-0040 Manuel D'instructions page 16

Troubleshooting
M3 Is the fan turning?
M4 Is there a refrigerant leak?
M5 Is the TXV or cap tube operating
normally?
M6 Does the ice making mode
convert to harvest?
Machine makes excessive noise.
Step Check
N1 Are the panels loose?
N2 Is the fan hitting the shroud?
N3 Is the fan blade loose?
N4 Is the pump noisy?
N5 Is there an object in the propeller? Remove the object
N6 Is the noise from the compressor? Replace the compressor
ADVANCED COMPONENT TROUBLESHOOTING TECHNIQUES
Refrigerant Cycle and Components
Before diagnosing the refrigeration system, it is very important that the refrigeration charge is correct.
Whenever the refrigeration system has been opened, the filter drier must be replaced and the proper
refrigerant charge must be weighed in.
Refrigerant Pressures
The suction pressure at the beginning of the freeze cycle can vary +/10 psi (.7 bar) depending on operating
conditions. Pressures less than this may indicate an undercharge. The discharge pressure on air cooled units
will vary with ambient conditions. Refrigerant in a gas state is pumped throughout the refrigeration system by
a hermetic compressor to the condenser. Heat is removed from the refrigerant either by forced air movement
through an air cooled condenser or transferring heat from the refrigerant to water through a water cooled
condenser. The refrigerant changes to a liquid when cooled. The refrigerant in a liquid state passes through a
filter drier. The filter drier traps small amounts of moisture and foreign particles from the system. The filter drier
must be replaced whenever the refrigeration system is opened or if the refrigerant has been completely lost.
Compressor
The compressor runs during the entire cycle. If the valves in the compressor are damaged, the compressor
will be unable to pump refrigerant efficiently. Damaged valves may be the result of another problem in the
M4
Add the valve, clean the
refrigerant, fix and charge
(replace filter)
M6
If yes, proceed to
Tighten all the screws
Realign
Tighten
N5
16
Replace fan motor
M5
Add the valve, clean the
refrigerant, fix and charge
(replace filter)
Replace the controller board
If no, proceed to
N2
N3
N4
N6
Replace the pump