Troubleshooting
56
ecoTEC plus installation and maintenance instructions 0020134823_01
14
14.2.2 Overview of status codes
Display Meaning
Heating mode
S 00
Heating, no heat demand
S 02
Heating mode pump flow
S 03
Heating mode, ignition
S 04
Heating mode, burner on
S 05
Heating mode, pump/fan overrun
S 06
Heating mode, fan overrun
S 07
Heating mode, pump overrun
S 08
Heating, remaining locking time in xx minutes
S 09
Heating mode measuring programme
Special cases
S 30
Room thermostat is blocking heating mode
S 31
Summer mode active or no heat requirement from eBUS
controller
S 32
Operation block function due to different fan speed
S 34
Frost protection mode active
S 36
Target value of the eBUS controller is < 20 °C and is
blocking heating mode
S 37
Fan waiting period: Fan failure in operation
S 39
Contact thermostat/"burner off contact" has responded
S 40
Comfort protection mode is active: Unit running with
limited heating comfort
S 41
Water pressure
>
0.2 MPa (2 bar)
S 42
Flue non-return flap return signal blocks burner opera-
tion (only in connection with VR40 accessory) or con-
densate pump faulty, heat requirement is blocked
S 53
Unit is within the waiting period of the modulation
block/operation block function due to low water pres-
sure (flow-return spread too large)
S 54
Unit is within the waiting period of the operation block-
ing function as a result of low water pressure (tempera-
ture gradient)
S 96
Return sensor test running, heating demands are
blocked
S 97
Water pressure sensor test running, heating demands
are blocked
S 98
Supply/return sensor test running, heating demands are
blocked
14.1 Overview of status codes
14.2.3
Service messages
If the
"open-end spanner" maintenance symbol appears
in the display, there is a service message. The maintenance
symbol appears if you have set a maintenance interval, for
example, (
¬ section 12.1.6
) and it has elapsed. The boiler is
not in fault mode but continues to operate.
To obtain more information about the service message:
>
Call up the "Live monitor" (
¬ section 14.2.1
).
If status code S.40 is displayed as well as the maintenance
symbol, the boiler is in Comfort protection mode. This
means that the boiler continues to operate with restricted
comfort after it has detected a fault (e.g. because of a
severe storm).
>
In this case, read out the fault memory in order to deter-
mine whether a boiler component is defective
(
¬ section 14.2.6
).
If no fault message is present, the boiler will automatically
switch back to normal operating mode after a certain time.
Comfort protection mode may then have been triggered by
a severe storm, for example.
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