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
834702_33GB_012005.qxd 09.03.2005 16:26 Uhr Seite 41
