44
Installation and maintenance instructions EASICOM 3 0020238426_04
Fault code
Meaning
Possible cause
F.23
Safety shutdown: Temperature spread
too great (NTC1/NTC2)
Pump blocked, insufficient pump output, air in product, flow and return NTC
connected the wrong way round
F.24
Safety shutdown: Temperature rise too
fast
Pump blocked, reduced pump output, air in product, system pressure too
low, non-return valve blocked/incorrectly installed
F.25
Safety shutdown: Flue gas temperature
too high
Break in plug connection for optional flue gas safety cut-out (SCO), break in
cable harness
F.27
Safety shutdown: Fault in flame detec-
tion
Moisture on the electronics, electronics (flame monitor) defective, gas solen-
oid valve leaking
F.28
Fault: Ignition unsuccessful when starting
up
Gas meter defective or gas pressure monitor has triggered, air in gas, gas
flow pressure too low, thermal isolator device (TAE) has triggered, incor-
rect gas injector, incorrect spare gas valve assembly, fault on the gas valve
assembly, multiple plug on PCB incorrectly plugged in, break in cable har-
ness, ignition system (ignition transformer, ignition cable, ignition plug, igni-
tion electrode) defective, ionisation flow interrupted (cable, electrode), incor-
rect earthing of product, electronics defective
F.29
Fault: Flame loss
Gas supply temporarily stopped, flue gas recirculation, incorrect earthing of
product, ignition transformer has spark failure
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
