E Overview Of Fault Codes - Vaillant ecoTEC plus 806 VU GB 806/5-5 Installation And Maintenance Instructions Manual

Appendix
Status code Meaning
S.32 Waiting period because of fan speed deviation
S.34 Frost protection mode active
S.36 Target value of the eBUS controller is < 20 °C and is blocking heating mode
S.37 Fan waiting period: Fan failure in operation
S.39 "Burner off contact" has triggered (e.g. contact thermostat or condensate pump)
S.40 Comfort protection mode is active: Product running with limited heating comfort
S.41 Water pressure > 0.6 MPa (6 bar)
S.42 Flue non-return flap response blocks burner operation (only in conjunction with accessory VR40) or condensate pump
defective; heat requirement is blocked
S.44 "Return flow temperature sensor" comfort protection mode is active; product running with limited heating comfort
S.46 "Flame lost at min. output" comfort protection mode is active; product running with limited heating comfort
S.47 "Flame lost at max. output" comfort protection mode is active; product running with limited heating comfort
S.48 "Deviating fan speed" comfort protection mode is active; product running with limited heating comfort
S.53 Product is within the waiting period of the modulation block/operation block function as a result of low water pressure
(flow/return spread too large)
S.54 Product is within the waiting period of the operation blocking function as a result of low water pressure (temperature
gradient)
S.96 Return sensor test running, heating demands are blocked.
S.97 Water pressure sensor test running, heating demands are blocked.
S.98 Flow/return sensor test running, heating demands are blocked.
E Overview of fault codes
Code Meaning
F.00 Flow temperature sensor interruption
F.01 Return temperature sensor interruption
F.10 Flow NTC short circuit
F.11 Return NTC short circuit
F.20 Safety switch-off: Temperature limiter
F.22 Safety switch-off: Low water pressure
F.23 Safety switch-off: Temperature difference too
great
F.24 Safety switch-off: Temperature rise too fast
F.25 Safety switch-off: Flue gas temperature too high
F.27 Safety switch-off: Flame simulation
F.28 Failure during start-up: Ignition unsuccessful
F.29 Failure during operation: Re-ignition unsuccess-
ful
F.32 Fan fault
42
Cause
NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
NTC defective, short circuit in cable harness, cable/casing
NTC defective, short circuit in cable harness, cable/casing
Incorrect earth connection between cable harness and product, flow or
return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode
No or insufficient water in the product, water pressure sensor defective,
cable to pump or water pressure sensor loose/not connected/defective
Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
Pump blocked, insufficient pump output, air in product, system pressure
too low, non-return valve blocked/incorrectly installed
Break in plug connection for optional flue gas safety temperature limiter
(STB), break in cable harness
Moisture on the electronics, electronics (flame monitor) defective, gas
solenoid valve leaking
Gas meter defective or gas pressure monitor has triggered, air in gas,
gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate duct blocked, incorrect gas restrictor, incorrect spare part
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 product,
electronics defective
Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, defective earthing of product, ignition transformer has spark
failure
Plug on fan not correctly plugged in, multiple plug on PCB not correctly
plugged in, break in cable harness, fan blocked, Hall sensor defective,
electronics defective
Installation and maintenance instructions ecoTEC plus 0020134823_04