Appendix; A Status Codes - Overview; B Troubleshooting - Vaillant ecoFIT sustain 835 Operating Instructions Manual

Appendix

Appendix
A Status codes – Overview
Status codes that are not listed here can be viewed in the installation instructions.
Status Parameter
code
Displays in heating mode
S.00 Heating: No heat demand
S.02 Heating mode: Pump pre-run
S.03 Heating mode: Ignition
S.04 Heating mode: Burner on
S.06 Heating mode: Fan overrun
S.07 Heating mode: Pump overrun
S.08 Heating mode: Anti-cycling time
Displays in hot water handling mode
S.10 DHW demand
S.14 DHW mode: Burner on
Displays in Comfort mode with warm start or hot water handling mode with cylinder
S.20 DHW demand
S.22 DHW mode: Pump pre-run
S.24 DHW mode: Burner on
Others
S.31 No heat demand: Summer mode
S.34 Heating mode: Frost protection
S.46 Waiting time: Measuring program

B Troubleshooting

Fault
Product does not The gas isolator cock installed on-site
start up: and/or the gas isolator cock on the
product is closed.
– No hot water
The power supply in the building is dis-
– Heating re-
connected.
mains cold
The product is switched off.
The heating flow temperature is set
too low or to the Heating off position,
and/or the hot water temperature is set
too low.
16
Meaning
Heating: No heat demand
Heating mode: Pump pre-run
Heating mode: Ignition
Heating mode: Burner on
Heating mode: Fan overrun
Heating mode: Pump overrun
Heating, remaining anti-cycling time xx
mins
Hot water requirement via flow sensor
DHW mode: Burner on
Hot water requirement
DHW mode: Pump pre-run
DHW mode: Burner on
Summer mode active
Frost protection mode, frost protection
Comfort protection mode, flame loss at
minimum load
Cause
Operating instructions ecoFIT sustain 0020230530_01
Measure
Open both gas isolator cocks.
Check the fuse in the building.
The product switches on automat-
ically when the power is restored.
Switch on the product (→ "Switch-
ing on the product" section).
Set the heating flow temperat-
ure and hot water temperature (→
"Setting the heating flow temper-
ature" section/→ "Setting the hot
water temperature" section).