Technical data

Installation and Servicing ecoTEC plus 43
Code Meaning Cause
F.27 Incorrect sensing of flame Flame detector defective
F.28 Appliance does not start: Attempts to ignite during start
failed
Faults in the gas supply such as:- - Gas meter or gas pressure
detector defective - Air in gas- Gas flow pressure too low - Fire
protection tap has disengaged Faults in the gas valve, wrong
gas setting, igniter (ignition transformer, ignition cable, ignition
plug) defective, ionisation current stopped (cable, electrode),
faulty earthing in appliance, electronics defective
F.29 Flame goes off during operation and subsequent ignition attempts failed Gas supply temporarily stopped, faulty
earthing of appliance
F.32 Fan speed variation Fan blocked, plug not inserted correctly on fan, hall sensor
defective, fault in cable harness, electronics defective
F.49 eBUS under voltage Short circuit on eBUS, overload on eBUS or two power sources
on eBUS with different polarity
F.61 Gas–valve control defective Short circuit/earth (ground) leak in cable harness to gas valves,
gas valve assembly defective (earth/ground leak from coils),
electronic control system defective
F.62 Gas valve shut off delay Gas valve leaking, electronics defective
F.63 EEPROM error Electronics defective
F.64 Electronics/NTC fault Short-circuit in flow or return NTC or electronics defective
F.65 Electronics temperature too high Electronics too hot due to external effect, electronics defective
F.67 Flame detector input signal is outside the limits (0 or 5
V)
Electr
onics defective
F.70 No valid DSN in display and/or main board Spare part failure display and main board interchanged at
same time and device specific number not adjusted
F.71 Flow NTC reports constant value (stuck at) Flow NTC is defective
F.72 Flow and/or return NTC fault Flow and/or return NTC is defective (tolerances too big)
F.75 No pressure rise was detected on turning on the pump Water pressure sensor or/and pump defective Air in the heating
system, quick bleeder defective Too little water in appliance;
check adjustable by-pass; connect external expansion vessel to
return
F.76 Overheating protection on primary heat exchanger
triggered
Cable or cable connection of fuse in the primary heat
exchanger defective, or primary heat exchanger defective
F.77 Condensate pump or feedback of accessories blocks
heating
Condensate pump defective or flume flap feedback triggered
F.78 Wrong configuration with accessory link box VR65 connected to combination boiler
con No communication to main board Connection error display main board
Table 10.4 Error codes (continued)
Troubleshooting 10
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