Appendix
36
Installation and maintenance instructions HOME 0020224355_00
Fault code
Meaning
Possible cause
F.22
Safety switch-off: Low water pressure in
the boiler
No or insufficient water in the product, water pressure sensor de-
fective, cable to the pump or to the water pressure sensor loose/not
connected/defective
F.23
Safety switch-off: Temperature difference
too great (NTC1/NTC2)
Pump blocked, insufficient pump output, air in product, flow and return NTC
sensors connected the wrong way round
F.24
Safety switch-off: Temperature rise too
fast
Pump blocked, reduced pump output, air in product, system pressure too
low, return flow prevention blocked/incorrectly installed
F.25
Safety switch-off: Flue gas temperature
too high
Break in connection for optional flue gas safety temperature limiter (safety
cut-out), break in cable harness
F.27
Safety switch-off: Fault in flame detection
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, incorrect
gas restrictor, incorrect spare gas valve, fault on the gas valve, multiple plug
on PCB incorrectly plugged in, break in cable harness, ignition system (ig-
nition transformer, ignition cable, ignition plug, ignition electrode) defective,
ionisation current interrupted (cable, electrode), incorrect 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.33
Fan frost protection function active: Air
pressure switch fault
Pressure monitor has not switched or has switched at a fan speed value that
is too high (insufficient air supply)
Pressure monitor plug not correctly plugged in, pressure monitor defective,
line removed from between the pressure monitor and silencer, air/flue pipe
blocked and silencer not installed properly
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 control system
Short circuit/short to earth in cable harness for the gas valve, gas valve
defective (coils shorted to earth), electronics defective
F.62
Fault: Gas valve switch-off control
Delayed switch-off of gas valve, delayed extinguishing of flame signal, gas
valve 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 re-
strictor, 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 sensor temperature difference too great
→
flow and/or
return temperature 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 line 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 low water pressure
F.77
Fault: Condensate or smoke
No response, flue non-return flap defective
F.78
Interruption to DHW outlet sensor at
external controller
Link box connected, but hot water NTC not bridged
Содержание home combi
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