20 Operating instructions 0020308119_02
Code Meaning
S.020 There is no demand for the domestic hot water cylinder charging.
S.022 The domestic hot water cylinder charging is active and the pump is in
prerun mode.
S.023 The domestic hot water cylinder charging is active and the unit ignites.
S.024 The domestic hot water cylinder charging is active and the burner is
operating.
S.026 The domestic hot water cylinder charging is active and the fan is in
overrun mode.
S.027 The domestic hot water cylinder charging is active and the heating
pump is in overrun mode.
S.028 The domestic hot water cylinder charging is active and the unit is in
burner anti-cycling time.
S.031 Heating mode has been deactivated and there is no domestic hot water
demand.
S.034 The frost protection function is active.
C Fault codes/limp home mode codes
Note
The code table only shows an extract of the entire code. If fault codes or limp
home mode codes other than those listed are displayed, action by a competent
person is required.
Code/meaning Possible cause Measure
F.022
No/insufficient water
in the product or the
water pressure is too
low.
Water deficiency in
the heating installation
1. Check the filling pressure of the heating
installation. (→ Section 5.4.1)
2. Top up with heating water.
(→ Section 5.4.2)
F.028
The flame signal was
not detected during
the ignition phase.
After five unsuccessful
ignition attempts, the
product has switched
to fault mode.
1. Check whether the gas stopcock is open.
2. Press the reset button for longer than
three seconds.
– Maximum number of repetitions: 3
3. If you are unable to eliminate the ignition
fault, contact a competent person.
D Troubleshooting
Symptom Possible cause Measure
Product does not start
up (no hot water,
heating remains cold)
The gas isolator cock
installed on-site and/or
the gas isolator cock
on the product is
closed.
▶ Open both gas isolator cocks.
The power supply in
the building is discon-
nected.
▶ Check the fuse in the building. The product
automatically switches back on when the
power supply is restored.
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