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© 2019 OJ Electronics A/S
Symptom
Cause
Action
Sensor for inlet
temperature
shown incorrectly
Fault in the electrical con-
nections
Check electrical connections.
Defective sensor: short-
circuited or disconnected
Check sensor. Remove the wires connected
to terminals 30 & 31 and check the resistance
using an ohmmeter.
If the sensor is disconnected, the resistance
will be infinitely high, while a resistance of
approx. 0.0 ohm indicates that the sensor is
short-circuited. If the sensor is OK, a resi-
stance of approx. 1078 ohm will be measured
at a sensor temperature of 20°C.
Replace the sensor if defective.
Incorrect sensor type
The sensor must be of PT1000 type, meaning
that the ohmic value of the sensor is approx.
1078 ohm at 20°C.
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
Frost alarm
inoperative
Frost thermostat
connected incorrectly
Check cables and connections (see fig. 12).
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
Frost alarm
inoperative
Incorrect web configuration
of frost thermostat
See installer instructions for correct input
configuration.
Window contact
inoperative
Window contact connected
incorrectly
Check cables and connections (see fig. 12).
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
Incorrect web configuration
of window contact
See installer instructions for correct input
configuration.
PIR sensor
inoperative
PIR sensor connected
incorrectly
Check cables and connections (see fig. 12).
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
Temperature offset
inoperative
Offset potentiometer
connected incorrectly
Check cables and connections (see fig. 11).
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
OJ GreenZone™ Module MP-Bus
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