F Check Programmes - Overview - Vaillant ecoTEC exclusive 835 Installation And Maintenance Instructions Manual

Code Parameter
F.81 Fault: cylinder charging pump
F.82 Fault: Ext. current anode
F.83 Fault: NTC temp. gradient
F.84 Fault: NTC temp. diff. implausible
F.85 Fault: NTCs fitted incorrectly
F.90 Fault: Communication
F.94 Fault: Vortex and differential pressure
LED actoSTOR electronics status
actoSTOR
module
Commu- Communication fault
nication
fault
Check programmes – Overview
F
Check programme
P.00 Purging
P.01 Maximum load
P.02 Minimum load
P.04 Reset eGas
P.06 Filling mode
P.14 Reset eGas
0020193968_05 ecoTEC exclusive Installation and maintenance instructions
Possible causes
Only in conjunction with F.91
Cylinder is not fully charged after specified time.
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External current anode not connected:
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External current anode connected:
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When the burner starts, the temperature change registered at the flow
and/or return temperature sensor is non-existent or too small.
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Flow and return temperature sensors returning implausible values.
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The flow and/or return temperature sensors have been installed on the
same pipe/incorrect pipe
Check the cable harness from the product to the actoSTOR module
(PEBus).
If the product is to be operated without an actoSTOR module, set
D.092 = 0.
Check: Pump (function), cable harness, plug, sensors.
LED on: Communication OK
LED flashing: Communication not OK
LED off: No power supply
Communication fault between display and PCB in the electronics box
Meaning
The internal pump is cyclically actuated. The heating circuit and domestic hot water circuit are purged
adaptively by automatically switching the circuits via the automatic air vent (the cap for the automatic
air vent is loosened at the factory). DHW circuit active or Heating circuit active display.
Start purging. once (Cancel): End purge programme. Note: The duration of the purge programme
is displayed using a countdown. The programme then ends.
After successful ignition, the product is operated at maximum heat input.
After successful ignition, the product is operated at minimum heat input.
Calling up the programme deletes all of the CH offsets (central heating) that have been saved from
previous calibration processes. The products then starts by fully calibrating the combustion regulation
(status S.09).
The prioritising diverter valve is moved to the mid-position. The burner and pump are switched off (to
fill or drain the product).
Calling up the programme deletes all of the DHW offsets that have been saved from previous calibra-
tion processes. The products then starts by fully calibrating the combustion regulation (status S.19).
Check cylinder charging sensor and cylinder sensor
Air in the actoSTOR pump
Inspect cable harness for pump
Check the impeller sensor and/or limiter in the product
Prioritising diverter valve defective
Secondary heat exchanger blocked
Pump defective
X43 edge connector with bridge missing from the PCB
Power supply to the external current anode was interrupted
Cable between PCB and external current anode defective
External current anode defective
Insufficient water in product
Flow or return temperature sensor not in correct position at pipe
Flow and return temperature sensors have been inverted
Flow and return temperature sensors have not been correctly in-
stalled
once:
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