Troubleshooting
Installation and maintenance instructions ecoTEC plus 0020116700_01 69
13
13.2.8 Overview of fault codes
Code Meaning Cause
F.00 Flow temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
F.01 Return temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
F.02 Interruption cylinder charging sensor actoSTOR
(NTC) only in combination with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
F.03 Interruption cylinder sensor actoSTOR (NTC)
only in combination with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
F.10 Flow NTC short circuit NTC defective, short circuit in cable harness, cable/casing
F.11 Return NTC short circuit NTC defective, short circuit in cable harness, cable/casing
F.12 Short circuit at cylinder charging sensor (NTC)
only in combination with F.91
NTC defective, short circuit in cable harness, cable/casing
F.13 VU-/VUW boiler: Short circuit warm start sensor/
cylinder sensor
VUW boiler with actoSTOR: Short circuit cylinder
sensor (NTC) only in combination with F.91
NTC defective, short circuit in cable harness, cable/casing
F.20 Safety switch-off: temperature limiter Incorrect earth connection between cable harness and boiler, flow or
return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode
F.22 Safety switch-off: low water pressure No or low water pressure in the boiler, water pressure sensor defective,
cable to pump or water pressure sensor loose/not connected/defective
F.23 Safety switch-off: Temperature difference too great Pump blocked, insufficient pump output, air in boiler, flow and return
NTC interchanged
F.24 Safety switch-off: Temperature rise too fast Pump blocked, poor pump performance, air in boiler, system pressure
too low, non-return valve blocks/incorrectly installed
F.25 Safety switch-off: Flue gas temperature too high Break in plug connection for optional flue gas safety thermostat (STB),
break in cable harness
F.26 Fault: Gas valve without function Gas valve stepper motor not connected, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, gas valve stepper
motor defective, electronics defective
F.27 Safety switch-off: Flame simulation Moisture on the electronics, electronics (flame monitor) defective, gas
solenoid valve leaking
F.28 Failure during start-up: ignition unsuccessful Gas meter defective or gas pressure regulator has triggered, air in gas,
gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate duct blocked, incorrect gas restrictor, incorrect ET gas valve,
fault on the gas valve, multiple plug on PCB incorrectly plugged in, break
in cable harness, ignition system (ignition transformer, ignition cable,
ignition plug, ignition electrode) defective, ionisation current interrupted
(cable, electrode), incorrect earthing of boiler, electronics defective
F.29 Failure during operation: Re-ignition unsuccessful Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, faulty earthing of boiler, ignition transformer has spark failure
F.32 Fan fault Plug at fan not correctly plugged in, multiple plug on PCB not correctly
plugged in, break in cable harness, fan blocked, Hall sensor defective,
electronics defective
F.35 Air/flue gas duct fault Air/flue gas duct blocked
F.42 Coding resistance fault (possible in combination
with F.70)
Short circuit/interruption in coding resistance output range (in cable
harness at heat exchanger) or gas group resistor (on PCB)
13.2 Fault codes
To Next Page
Loading...
Need help?
General
