Fri-Jado MCC 120, Service Manual

Page: 69 / 105

Service Manual MCC Cold US 20220700
Page 69
9.3
Trouble Shooting Analytical description
Description of part Symptoms Possible causes Solution / Action
Contactor Contactor does not
work
Wiring
Coil malfunction
Contact burned
Check wiring
Check resistance of coil
+/- 525Ω
Check the contacts
Replace contactor
Cooling engine
(COLD unit)
Cooling system does
not initiate (compressor
doesn’t run
Wiring cooling
Engine
Compressor
Malfunction
Check wiring
Replace cooling engine
Tumble switch Light, heating or cooling
does not switch on
Wiring
Contact burned
Check wiring
Check the voltage on “in“ and
“output“
LED Light does not turn on Wiring
LED broken
Led driver defect
Check Wiring
Replace LED
Replace LED driver
Electronic thermostat Display does not light
up
The unit is not reaching
the set temperature
Wiring
Loose sensor
Thermostat
Malfunction
Thermostat setting
Check wiring
Check sensor
Replace thermostat
Check parameters
Defrost sensor
(Cold Unit)
Ice on evaporator
The unit is not reaching
the set temperature or
does not cool at all
The unit becomes too
cold
Condensor blocked
Broken Sensor
Loose sensor
Broken Sensor
Loose sensor
Clean condensor with long
haired soft brush
Replace sensor
Check sensor wiring
Replace sensor
Check sensor wiring
Air out sensor
(Cold Unit)
Ice on evaporator
The unit is not reaching
the set temperature or
does not cool at all
The unit becomes too
cold
Condensor blocked
Broken Sensor
Loose sensor
Broken Sensor
Loose sensor
Clean condensor with long
haired soft brush
Replace sensor
Check sensor wiring
Replace sensor
Check sensor wiring