Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 59

Code
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 over-
run
S.28 DHW anti-cycling time
S.30 No heat demand: Con-
troller
S.31 No heat demand: Sum-
mer mode
S.32 Waiting time deviation:
Fan speed
S.34 Heating mode: Frost pro-
tection
S.36 Target value for ext. con-
troller lower than 20 °C
S.39 Contact thermostat
triggered
S.40 Comfort protection act-
ive
S.41 Water pressure too high
S.42 Flue non-return flap
closed
S.46 Comfort protection: Min-
imum load, loss of flame
S.53 Waiting time: Water
shortage
S.54 Waiting time: Water
shortage
S.57 Waiting time: Measuring
program
S.58 Burner modulation limit-
ation
S.61 Fault: Incorrect gas type
S.62 Adjust CO2
S.63 Fault: Check gas route
S.76 Service message: Check
water pressure
S.85 Service message: Check
water circulation volume
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
S.98 Flow/return temperature
sensor self-test
S.99 Vaillant self-test
0020261389_03 ecoTEC plus Installation and maintenance instructions
Meaning
The pump prerun for domestic hot water mode is activated.
The ignition for domestic hot water mode is activated.
The burner for domestic hot water mode is activated.
The pump/fan overrun for domestic hot water mode is activated.
The fan overrun for domestic hot water mode is activated.
The pump overrun for domestic hot water mode is activated.
The anti-cycling time for domestic hot water mode is activated.
Room thermostat blocks heating mode.
Summer mode is activated; there is no heat demand.
The waiting period for the fan start-up is activated.
The frost protection function for heating mode is activated.
The target value on the external control is lower than 20 °C.
The surface-mounted thermostat or the condensate pump has triggered.
The comfort protection mode is activated.
The system pressure is too high.
Flue non-return flap return signal blocks burner operation (only in conjunction with the multi-functional
module) or condensate pump defective, heat demand is blocked.
Comfort protection mode for flame loss at minimum load is activated.
The product is within the waiting period of the modulation block/operating block function as a result of
a water deficiency (flow/return spread too large).
Product is in the waiting period of the operation blocking function as a result of low water pressure
(temperature gradient).
The product is within the waiting period as a result of the measuring programme.
The burner modulation limitation is activated.
The coding resistor on the PCB does not match the entered gas group (see also F.92).
Set the CO content.
2
A fault message is activated. Check the gas route.
A service message is activated. Check the water pressure.
A service message is activated. Check the water circulation volume.
The purge programme is activated.
The self-test for the water circulation volume is activated.
Flue gas analysis is not currently possible.
The self-test for the return temperature sensor is activated.
The self-test for the water pressure sensor is activated.
The self-test for the flow/return temperature sensor is activated.
The Vaillant self-test is activated.
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