C Overview Of Fault Codes - Vaillant ecoTEC pro 24 Installation And Maintenance Instructions Manual

Appendix
Statuscode
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.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
C Overview of fault codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Message
F.00 Interruption: Flow sensor
F.01 Interruption: Return
sensor
F.10 Short circuit: Flow
sensor
F.11 Short circuit: Return
sensor
F.20 Safety switch-off: Tem-
perature limiter
F.22 Safety switch-off: Low
water pressure
F.23 Safety switch-off:
Temp.spread too large
36
Meaning
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.
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.
Possible cause
Flow temperature sensor de-
fective or not connected
Return temperature sensor de-
fective or not connected
Flow temperature sensor de-
fective or has short-circuited
Return temperature sensor de-
fective or has short-circuited
Maximum temperature at the
flow/return temperature sensor
is too high when the safety cut-
out function is operating using
the NTC
No/insufficient water in the
product or the water pressure is
too low
Temperature spread too great.
Water circulation too low
Measure
▶
Check: Flow temperature sensor, plug, cable harness, PCB.
▶
Check: Return temperature sensor, plug, cable harness, PCB.
▶
Check: NTC plug, cable harness, cable/housing, PCB, NTC
sensor.
▶
Check: NTC plug, cable harness, housing, PCB, NTC sensor.
▶
Check: Flow temperature sensor (correct thermal connection),
cable harness, sufficient purging.
1. Check: Plug, cable to heating pump or water pressure
sensor, water pressure sensor, heating pump.
2. Activate and purge check programme P.0.
▶
Check: Plug, cable to heating pump/water pressure sensor,
air/insufficient water in the heating circuit, flow and return tem-
perature sensor inverted, strainer in the hydraulic block, water
pressure sensor, heating pump (sufficient circulation, level 2:
D.19, D.14, non-return valve). Activate check programme P.0.
Installation and maintenance instructions ecoTEC pro 0020244995_02