Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 41)

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.

• 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

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 41

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