Troubleshooting
Condens 8300i W ā 6721841531 (2022/10)
54
Table 28 Indicators and fault displays
2966 B Flow temperature rise in heat exchanger too
rapid
1. Ensure that the heating circulation is working correctly.
2. Check pump setting, adjust to match heating system if necessary.
3. Connect the plug to the temperature sensor correctly.
4. Connect the plug to the control device correctly.
5. Attach the temperature sensor correctly.
6. Check the temperature sensor, replace if necessary.
7. Check temperature sensor connecting lead, replace if necessary.
2970 B Pressure drop in heating system too rapid ā
2971 B System pressure too low 1. Vent the heating system.
2. Check the heating system for tightness.
3. Top up water until the target pressure is reached.
4. Check the pressure sensor, replace if necessary.
5. Check the pressure sensor cable, replace if necessary.
2972 Mains voltage too low 1. Establish supply voltage of at least 196 VAC.
2. Replace burner control unit.
2980 V The unit has been locked for safety reasons
after at least five locking faults have
occurred within 15 minutes.
The safety lock may only be lifted by a specialised contractor after troubleshooting and a
subsequent on-site system inspection have been successful.
1. Diagnose and remedy the malfunction.
2. Check the complete system, including sensors and harnesses
3. Switch unit off and on again.
Fault code 2981 is displayed.
2981 V The unit was switched off and on again with
the safety lock (fault code 2980) in place.
The safety lock may only be lifted by a specialised contractor after troubleshooting and a
subsequent on-site system inspection have been successful.
1. Reset the unit within 10 minutes after switching it on.
2. Reset the unit again after 22 to 28 seconds..
The lock is removed and the unit returns to normal operation.
3. Double-check the last 10 faults in the fault history to confirm the fault has been
remedied
Fault
code
Fault
category
Fault text on the display, description Remedy
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