0020308121_04 Installation and maintenance instructions 85
I Maintenance codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Code/meaning Possible cause Measure
I.003
The product's maintenance time
has been reached.
Maintenance interval elapsed 1. Carry out maintenance work.
2. Reset the service interval.
I.020
The water pressure in the heat-
ing system is at the lower limit.
Filling pressure of the heating
installation is low
▶ Top up the heating installation.
I.144
The electrode drift test shows
progressed ageing of the con-
trol electrode.
The drift test electrode has
reached the maximum permiss-
ible value
▶ Replace the control electrode and reset the drift offsets via
D.146 and D.147.
J Reversible limp home mode codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question. The
reversible L.XXX codes eliminate themselves. Check programmes ( P.XXX) and actuator tests (T.XXX) can tem-
porarily block L.XXX codes.
Code Meaning
L.016 A flame loss has been detected at minimum output.
L.022 The circulation water volume in the heating circuit is too low.
L.025 The cold water inlet temperature sensor has short-circuited.
L.032 The volume flow sensor is defective or the signal is not plausible.
L.095 The gas valve stepper motor has reached the minimum permissible step number.
L.096 The gas valve stepper motor has reached the maximum permissible step number.
L.097 The air ratio is too low.
L.105 The unit is not purged correctly. The purge programme could not be completed successfully.
L.144 The ionisation signal for the control electrode is too low. The drift adaptation has failed.
L.194 The power supply unit for the PCB is faulty.
L.195 The unit has detected undervoltage in the power supply.
L.196 The unit has detected overvoltage in the power supply.
L.319 The unit's internal bypass valve is blocked.
L.320 The heating pump is blocked. The unit attempts to loosen the blockage.
L.322 The pump electronics have overheated.
L.343 The signal for the air-mass flow sensor is not plausible.
K Irreversible limp home mode codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question. The
irreversible N.XXX codes require action.
Code/meaning Possible cause Measure
N.013
The signal for the water pres-
sure sensor is invalid.
Water pressure sensor defect-
ive
▶ Check and, if required, replace the water pressure sensor.
Interruption in the wiring har-
ness
▶ Check the wiring harness including all plug connections and, if
required, replace it.
Short circuit in the connection
cable
▶ Check the connection cable and, if required, replace it.
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