MINUS
40
MINUS40 (PTY) Ltd Head Office: 8 Manhattan Street | Airport Industria Ext 2 | Western Cape
Tel: +27 (0) 21 386 2290 | E-mail: service@minus40.co.za
MINUS40 Instruction Manual
Mobile Fridge/Freezer
Table 1. FAULT FINDING
FAULT
POSSIBLE REASON
CORRECTION
Compressor does not run
Flashes
once
every 4 Seconds
• Battery protection cut-out due to too low voltage supply
• Battery charge low
• Check the wiring thickness as per the manual
• Check for loose connections in the plugs or leads.
Compressor does not run
Flashes
Twice
every 4 Seconds
• Fan motor high current cut-out due to too many start
attempts or fan over current or fan current higher than 0.5A
• Check for low battery and re-charge, with fridge disconnected with
battery.
Compressor does not run
Flashes
Three times
every 4
Seconds
• Motor start error due to a blocked rotor or the differential
pressure in the refrigeration system is too high (+5bar)
• Disconnect fan at F.
• If the problem goes away, replace the fan.
• If the problem persists, contact the Minus40 service team
Compressor does not run
Flashes
Four times
every 4
Seconds
• Minimum motor speed error due to refrigeration system
to heavily loaded or the motor cannot maintain minimum
speed at approximately 1.80rpm
• Switch the unit off for 15 minutes to allow differential pressure to
equalize in the refrigeration system. Then, restart the fridge/freezer
Compressor does not run
Flashes
Five times
every 4
Seconds
• Thermal cut-out of the electronic unit due to fridge/freezer
being loaded too heavily or too high ambient temperature.
• Check that the fan is working
• Check that the ambient temperature does not exceed 55
°
C.
• Pre-cool the unit before loading.
Compressor does not run
Flashes
Six times
every 4
Seconds
• Thermostat failure if the NTC thermostat has a short-circuit
or has no connection.
• Contact the Minus40 service team
Compressor does not run and red
LED Does
• Faulty thermostat with a loose connection at T or C
• Wrong polarity
• Fault at speed regulating resistor
• Replace the thermostat
• Check that Positive of the battery is connected to the red wire and
the negative to the black wire
• Replace with 820-ohm resistor or temporarily replace the resistor
with a conductor.
No OR reduced cooling capacity
• Gas leakage or blockage in the refrigeration system
• Faulty fan motor
• Contact the Minus40 service team
• Replace fan motor.
