Fault finding 10
Instructions for installation and servicing aquaPLUS VUI 362-7 41
10.5 Fault codes
Fault codes take priority over all other display functions
in the event of a system fault occurring.
If multiple faults occur, the corresponding fault codes
are displayed alternately for about two seconds each.
10.6 Fault memory
The fault memory stores detalis of the ten most recent
faults.
• Press the "i" and "-" buttons simultaneously.
Table 10.4: Fault codes
• Use the "+" button to scroll back through the list of
memorised errors.
To cancel fault error memory display mode, proceed as
follows:
• Press the "i" button below the display.
or
• Do not touch any key for about four minutes. The
display will now revert back to showing the current
flow temperature.
Display Indication Cause
F.00 Flow-NTC: NTC broken; NTC cable broken; Flow-NTC cable defective/broken NTC faulty
Defective connection at NTC, Defective connection
at electronics
F.01 Return NTC: NTC broken; NTC cable broken; Return-NTC cable defective/broken NTC faulty
Defective connection at NTC, Defective connection
at electronics
F.02 DHW-NTC: NTC broken; NTC cable broken; Defective DHW- NTC cable defective/ broken NTC faulty
connection at NTC; Defective connection at
electronics
F.03 Tank-NTC: NTC broken; NTC cable broken; Defective Tank- NTC cable defective/ broken NTC faulty
connection at NTC; Defective connection at
electronics
F.10 Short circuit - flow-NTC (<130 °C) NTC-plug shorted to casing, NTC defective
F.11 Short circuit - return-NTC (<130 °C) NTC-plug shorted to casing, NTC defective
F.12 short circuit DHW- NTC NTC- plug shorted to casing, NTC defective
F.13 short circuit tank- NTC NTC- plug shorted to casing, NTC defective
F.20 Over heat cut off activated Maximun temperature exeeded
F.22 Dry fire protection No water in appliance, pump cable defective, pump blocked or
defective, pump output too low
F.23 Dry fire protection (difference between flow and No water in appliance, pump cable defective, pump blocked
return NTC's too large) or defective, pump output too low
F.24 Dry fire protection (temperature gradient of flow Air in boiler/system, pump blocked or defective,
NTC too steep) pump output too low
F.27 No demand to gas valve Electronic board defective; Gas valve defective
F.28 Boiler goes to lock out No gas; Insufficient gas; Incorrect gas valve adjustment;
Electrode defective; Ignition lead defect; Electronic igniter
defective
F.29 Flame extinguished re-ignition unsuccesful Gas supply absent or insufficient
F.32 Main heat exchanger anti freeze protection mode Check fan control cables/connections; Defective fan control cable;
due to fan speed deviation too great
F.33 Main heat exchanger anti freeze protection mode due Check air pressure switch, fan, fan supply or flue system
to no switching signal from the air pressure switch
F.37 The rotary speed of the fan is too high or too low Air pressure switch defect; fan defect; electronics defect
F.41 No setting for the type of gas is stored Set gas type in PCB (see page 30)
F.42 Faulty cable loom Faulty or incorrect loom fitted
F.43 Faulty cable loom Faulty or incorrect loom fitted
F.60 Electronic fault Electronics defect
F.61 Electronic fault Electronics defect
F.62 Flame rectification present 4 secs. after gas valve Check gas valve, burner tubes and injectors or electronics defect
turns off
F.63 EMC fault EMC or electronics defect
F.64 Sensor or electronics fault Check NTC's/connections or electronics defect
F.65 PCB processor temperature too high Check earth connection or electronics defect
F.66 Display fault Display defect; fault in the connection to the display;
electronics defect
F.67 Electronic fault Electronics defect
