8. FAULTS
When the controller detects a fault, the red fault LED flashes (above the
Reset button) and a fault code is shown on the Temperature display.
After the fault has been remedied, the controller can be restarted by
pressing the Reset button for 5 secs.
The following faults are detected and displayed:-
Temperature
display
Description Possible cause/remedy
10, 11, 12, 13, 14 Sensor fault S1 • Check the wires for breaks
• Replace S1
20, 21, 22, 23, 24 Sensor fault S2 • Check the wires for breaks
• Replace S2
0 Sensor fault after self-check • Replace boiler sensor S1 and/or S2
1 Temperature too high • Air in system
• Pump does not run
• Too little circulation in system, radiators closed,
pump setting too low
2 Exchange S1 and S2 • Check the cable loom
• Replace S1 or S2
4 No flame signal • Gas tap closed
• Incorrect ignition distance
• Gas inlet pressure too low or disappears
• Gas valve or ignition unit does not receive voltage
5 No flame signal • Condensate discharge blocked
• Check setting of gas valve
6 Flame detection fault • Replace ignition cable + spark probe
• Replace ignition unit
• Replace controller
8 Fan speed incorrect • Fan rubs against casing
• Wiring between fan and casing
• Check the wires for poor contact (tacho signal)
• Replace fan
29, 30 Gas valve relay fault • Replace controller
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