Appendix
36 Installation and maintenance instructions EASICOM 3 0020239562_02
Fault code Meaning Possible cause
F.32 Fan frost protection function active: Fan
speed outside the tolerance values
Plug on fan not correctly plugged in, multiple plug on PCB not correctly
plugged in, break in cable harness, fan blocked, Hall sensor defective, elec-
tronics defective
F.49 eBUS fault: Voltage too low Short circuit on eBUS, eBUS overload or two power supplies with different
polarities on the eBUS
F.61 Fault: Gas valve assembly control Short circuit/short to earth in cable harness for the gas valve assembly, gas
valve assembly defective (coils shorted to earth), electronics defective
F.62 Fault: Gas valve switch-off control Delayed switch-off of gas valve assembly, delayed extinguishing of flame
signal, gas valve assembly leaking, electronics defective
F.63 Fault: EEPROM Electronics defective
F.64 Fault: Electronics/sensor/analogue-to-
digital converter
Flow or return NTC short circuited, electronics defective
F.65 Fault: Electronics temperature too high Electronics overheating due to external influences, electronics defective
F.67 Value sent back by ASIC is incorrect
(flame signal)
Implausible flame signal, electronics defective
F.68 Fault: Unstable flame (analogue input) Air in gas, gas flow pressure too low, incorrect air ratio, incorrect gas in-
jector, ionisation flow interruption (cable, electrode)
F.70 Invalid product code (DSN) Replace the screen and PCB at the same time without reconfiguring the
product's Device Specific Number
F.71 Fault: Flow/return temperature sensor Flow temperature sensor specifies a constant value: Flow temperature
sensor incorrectly attached to the flow pipe, flow temperature sensor de-
fective
F.72 Fault: Deviation in the water pressure
sensor/return temperature sensor
Flow/return NTC temperature difference too great → flow and/or return tem-
perature sensor defective
F.73 Fault: Water pressure sensor not con-
nected or has short-circuited
Interruption/short circuit of water pressure sensor, interruption/short to earth
in supply pipe to water pressure sensor or water pressure sensor defective
F.74 Fault: Electrical problem in the water
pressure sensor
Line to water pressure sensor has a short circuit to 5 V/24 V or internal fault
in the water pressure sensor
F.75 Fault: Pressure sensor Pressure sensor or pump defective or water deficiency
F.77 Fault: Condensate or smoke No response, flue non-return flap defective
F.78 Interruption to DHW outlet sensor at the
external control
Link box connected, but domestic hot water NTC not bridged
F.83 Fault: Dry fire When the burner starts, the temperature change recorded by the flow or
return temperature sensor is non-existent or too small: Insufficient water in
the product, flow or return temperature sensor incorrectly attached to the
pipe
F.84 Fault: Flow/return temperature sensor Values not consistent, difference < -6 K
Flow and return temperature sensors signalling implausible values: Flow and
return temperature sensors have been inverted, flow and return temperature
sensors have not been correctly installed
F.85 Fault: Temperature sensor The flow and/or return temperature sensors have been installed on the same
pipe/incorrect pipe
Temperature sensor not connected or is connected incorrectly
F.86 Fault: Underfloor heating contact Underfloor heating contact open, sensor disconnected or defective
F.87 Fault: Ignition electrode Ignition electrode not connected properly, short circuit in the cable harness
F.88 Fault: Gas valve assembly Gas valve assembly not connected or it is connected incorrectly, short circuit
in the cable harness
F.89 Fault: Pump Pump not connected or it is connected incorrectly, incorrect pump connec-
ted, short circuit in the cable harness
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