Thermostat Test - Northern Fridge TruckFridge TF49 Manual

No. of flashes Error Type
5 Thermal cut-out of electronic unit
(If the refrigeration system has been too heavily loaded, or if the ambient temperature is
high, the electronic unit will run too hot).
4 Minimum motor speed error
(If the refrigeration system is too heavily loaded, the motor cannot maintain minimum
speed 1,850 rpm).
3 Motor start error
(The rotor is blocked or the differential pressure in the refrigeration system is too high
(>5 bar)).
2 Fan over-current cut-out
(The fan loads the electronic unit with more than 1A peak).
1 Battery protection cut-out
(The voltage is outside the cut-out setting)
6.3

Thermostat Test

If the thermostat is defective the refrigerator fan and compressor may not operate. To test the thermostat please
follow the following test procedure. See Figure 6.3.1: Thermostat Test Procedure Below.
1. Disconnect the "Blue" wire from the "T" terminal.
2. Disconnect the single "Brown" wire from the "P" terminal.
3. Reconnect the single "Brown" wire to the "T" terminal
4. If the fan and compressor turn on, the thermostat is defective
5. If the fan and compressor do not turn on, contact Northern Fridge support for service
6. Reconnect the "Blue" wire to the "T" terminal and reconnect single "Brown" wire to the "P" terminal
Updated 5 July 2020
TruckFridge Built-in User Manual
Table 6.2.2: Error Code Summary Table
Figure 6.3.1: Thermostat Test Procedure
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