Vaillant ecoTEC exclusive 843 Installation And Maintenance Instructions Manual page 42

Appendix
Status code Parameter
S.17 DHW mode: Pump overrun
S.19 DHW mode: Measuring program
Comfort mode, warm start or domestic hot water mode with actoSTOR
S.20 DHW demand
S.21 DHW mode: Fan start-up
S.22 DHW mode: Pump pre-run
S.23 DHW mode: Ignition
S.24 DHW mode: Burner on
S.25 DHW mode: Pump/fan overrun
S.26 DHW mode: Fan overrun
S.27 DHW mode: Pump overrun
S.28 DHW anti-cycling time
S.29 DHW mode: Measuring program
Others
S.30 No heat demand: Controller
S.31 No heat demand: Summer mode
S.32 Waiting time deviation: Fan speed
S.33 Waiting time: Air monitor
S.34 Heating mode: Frost protection
S.36 Target value for ext. controller lower than 20 °C
S.37 Waiting time: Deviation in fan speed
S.39 Contact thermostat triggered
S.40 Comfort protection active
S.41 Water pressure too high
S.42 Flue non-return flap closed
S.46 Comfort protection: Minimum load, loss of flame
S.53 Waiting time: Water shortage
S.54 Waiting time: Water shortage
S.55 Waiting time: CO sensor
S.56 Waiting time: CO limit value exceedance
S.57 Waiting time: Measuring program
S.58 Burner modulation limitation
S.59 Waiting time: Water circulation vol.
S.76 Service message: Check water pressure
S.86 Service message: Check vortex sensor
S.88 Purging programme is running
S.92 Water circulation volume self-test
S.93 Flue gas measurement not possible
S.96 Return temperature sensor self-test
S.97 Water pressure sensor self-test
42
Meaning
DHW mode: Pump overrun
DHW mode: Measuring programme
Domestic hot water requirement
DHW mode: Fan start-up
DHW mode: Pump prerun
DHW mode: Ignition
DHW mode: Burner on
DHW mode: Pump/fan overrun
DHW mode: Fan overrun
DHW mode: Pump overrun
Domestic hot water burner anti-cycling time
DHW mode: Measuring programme
Room thermostat (RT) is blocking heating mode
Summer mode active or no heat requirement from eBUS
control
Waiting period because of fan speed deviation
Waiting period: Air pressure sensor/switch reports that
the pressure signal is too low
Frost protection mode active
Reference setting for continuous controller 7-8-9 or
eBUS controller is < 20°C and blocks the heating mode
Waiting period: Fan failure in operation
"Burner off contact" has responded (e.g. surface-moun-
ted thermostat or condensate pump)
Comfort protection mode is active: Product running with
limited heating comfort
Water pressure > 2.8 bar
Flue non-return flap response blocks burner operation
(only in conjunction with accessory VR40) or condensate
pump defective; heat requirement is blocked
Comfort protection mode, flame loss at minimum load
Product is within the waiting period of the modulation
block/operating block function as a result of water defi-
ciency (flow/return spread too large)
Product is within the waiting period of the operating
blocking function as a result of water deficiency
(temperature gradient)
Waiting period: CO sensor
Waiting period: CO limit value exceedance
Calibration unsuccessful. Waiting period, comfort protec-
tion mode
Modulation limitation due to noise/wind
Minimum circulation water volume
System pressure too low. Top up water.
Service message: Check vortex sensor
Purging programme is running
Water circulation volume self-test
Flue gas analysis not possible because not all measur-
ing programmes have yet run
Return sensor test running, heating demands are
blocked.
Water pressure sensor test running, heating demands
are blocked.
Installation and maintenance instructions ecoTEC exclusive 0020193968_03