116116
Warnings
Installation
Use
Code
shown
Cause Consequences
Diagnostics and
troubleshooting
Err
W.19
Discontinued power
supply
- Discontinued power supply
Err
P.20
Condenser sensor
defective (temperature
< 0 °C or > 100 °C)
H.P. stops. Heating
via electric backup.
Check the connections and cor-
rect positioning of the sensor.
Check the sensor's ohmic value.
If nothing to report, replace the
sensor.
Err
P.21
Outdoor air sensor
defective
(measuring <-20°C
or >70°C).
Heat pump stops.
Heating via electric
backup.
Check the connections and cor-
rect positioning of the sensor.
Check the sensor's ohmic value.
If nothing to report, replace the
sensor.
Err
P.23
Outside unit evap-
orator sensor
defective.
Heat pump stops.
Heating via electric
backup.
Check the connections and cor-
rect positioning of the sensor.
Check the sensor's ohmic value.
If nothing to report, replace the
sensor.
Err
P.25
High pressure fault Heat pump stops.
Heating via electric
backup.
Check the connection of the
pressure switch, and its wiring
harness.
Check the pressure in the refrig-
eration circuit (refrigeration engi-
neer), and make sure that the
circuit is not blocked and there
are no non-condensable gases.
Err
P.27
Discharge sensor
defective
Heat pump stops.
Heating via electric
backup.
Check the connections and cor-
rect positioning of the sensor.
Check the sensor's ohmic value.
If nothing to report, replace the
sensor.
Err
P.29
Return ow tempera-
ture fault
Heat pump stops.
Heating via electric
backup.
Check the charge.
Check that the outside unit is
operating correctly and that the
service valves are open.
Check the sensor's ohmic value,
check the charge (by weighing),
replace with fresh gas (risk of
non-condensable gases). If the
error persists, there may be a
compressor fault.
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