Vaillant ecoMAX 635, Instructions For Installation And Servicing

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8 Troubleshooting
Instructions for installation and servicing ecoMAX
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Key to Fault codes
Code Meaning Cause
F.0 Flow–NTC:
– NTC broken
– NTC cable broken
Flow–NTC cable defective/broken NTC faulty
– Defective connection at NTC
– Defective connection at electronics
F.1 Return–NTC:
– NTC broken
– NTC cable broken
Return–NTC cable defective/broken NTC faulty
– Defective 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.13 Short circuit in tank sensor NTC defective, earth leak/short circuit in cable loom,
damp plug connection
F.20 Over heat cut off activated Maximum temperature exceeded
No water in system
F.22 Low water or no water in appliance Pump defective
Pump lead defective
F.23 Water level low Pump obstructed, pump running at lower capacity,
Temperature range too wide Air in appliance, system pressure too low,
flow and backflow NTC reversed
F.24 Water level low Pump obstructed, pump running at lower capacity,
Temperature rises too fast ir in appliance, system pressure too low,
flow and backflow NTC reversed
F.25 Water Switch Water Switch - plug disconnected
System pressure too low Waterswitch activated
F.27 No demand to gas valve Electronic board defective
Gas valve defective
No gas
Insufficient gas
Incorrect gas valve adjustment
F.28 Boiler goes to lock out Electrode defective
Ignition lead defect
Electronic igniter defective
Check air inlet duct
F.29 Flame extinguished re–ignition unsuccessful Gas supply absent or insufficient
Check flue duct
F.32 Fan turning–speed malfunction Fan unit obstructed, plug–in fan connector not
(too fast at start–up) correctly inserted, Hall sensor defective, fault in cable
loom, defective electronic control system
F.60 Gas–valve c defective Short circuit/earth (ground) leak in cable loom to gas
valves, gas valve assembly defective (earth/ground
leak from coils), electronic control system defective
Short circuit/earth (ground) leak in cable loom to gas
F.61 Gas–valve control – defective valves, gas valve assembly defective (earth/ground
leak from coils), electronic control system defective
F.62 Defective gas–valve closure mechanism Leak in gas valve assembly, electronic fault
F.63 EEPROM error Electronic fault
F.64 Electronic system/sensor fault Short circuit in flow or backflow NTC,
electronic fault
F.65 Electronic system temperature too high Electronic system affected by external heat source,
electronic fault
F.67 Electronic fault in flame system Electronic fault
(non–plausible flame signal)
Table 8.3
80020014605_00GB_032006 22.02.2006 21:36 Uhr Seite 34