14
4. Errors
Error Code Description Remedy
Short Circuit
Sensor (or very low
resistance)
1� De-energize/isolate unit from power supply
2� Disconnect sensor and verify sensor resistance Rs between white wire and each of
the red wires > 80 Ohm
3� If Rs < 80 Ohm, replace sensor (HARD-78)
4� Otherwise verify sensor wiring and/or sensor extension lead and reconnect
Open Circuit Sensor 1� De-energize/isolate unit from power supply
2� Disconnect sensor and verify sensor resistance Rs between white wire and each of
the red wires < 166 Ohm
3� If Rs > 166 Ohm, replace sensor (HARD-78)
4� Otherwise verify sensor wiring and/or sensor extension lead and reconnect
Low Temperature
Threshold Alarm
1� Verify heating system & sensor position
2� Verify appropriateness of Low Temperature Alarm setting in Menu
High Temperature
1
Threshold Alarm
1� Verify heating system and sensor position
2� Verify appropriateness of High Temperature Alarm setting in Menu
Output Voltage
Error
2
1� De-energize/isolate unit from power supply
2� If no contactor:
a� Verify that Wire bridge W1 interconnects Terminal 3 and 6 (L)
b� Verify that Wire bridge W2 interconnects Terminal 5 and 8
3� In case a contactor is connected, set parameter U to 1 (Voltage Free) in Menu
4� Verify that the sensor extension is shielded and grounded
5� If Err 5 re-occurs and remains, the output relay or triac is defect: replace unit
Supply below
207Vac�
3
Verify supply voltage between terminals 7 (L) and 10 (N) when Error 6 is displayed
1
Detection of this error is disabled if
High Temperature Alarm is set off�
2
Detection of this error is disabled in
Voltage Free Mode�
3
Unit is not active when supply voltage is
below approx� 190 Vac�
All alarms are on the same alarm relay�
An alarm will clear automatically as soon as the error condition is gone� There is no
need to reset; all settings are maintained�
If multiple alarms are active, the alarms are shown with the following priority:
(Highest),
, , , , (Lowest)
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