Presentation
Code displayed
No communication
between the screen
Err W.10
and the power
No Off-Peak signal
Err W11
Err H.15
Date/Time not set
The control detects
that the product
Err W.19
as peak/off-peak
Air temperature
Err P.21
Evaporator sensors
Err P.22
HP pressure switch
Err P.25
compressor open
or capacitor faulty
Discharge sensor
Err P.27
Err P.29
temperature fault
Installation
Causes
Electric heating element
heating in degraded
mode up to 62 °C and
board
no screen display update.
operates without taking
detection
off-peak periods into
programmed time slots.
The tank is no longer
is connected
sensor faulty
faulty
or Klixon
faulty
Return flow
Use
Consequences
The water heater
account.
The water heater
disregards the
protected against
corrosion.
Heat pump stops.
Heating via electric
backup.
Heat pump stops.
Heating via electric
backup.
Heat pump stops.
Heating via electric
heating element.
Heat pump stops.
Heating via electric
heating element.
Heat pump stops.
Heating via electric
heating element.
Maintenance
Troubleshooting
Check the connections and link cables
between the screen and the power board.
Check the wiring and transmission of the
off-peak signal.
Change the start authorisation settings.
Enter the date and time.
Check the electrical wiring to ensure that
the power supply is permanent.
Check the connection (A4) and correct
positioning of the sensor.
Check the ohmic value of the sensor
(see table below).
If necessary, replace the sensor.
Check the connection (A4 and A2) and
correct positioning of the sensor.
Check the ohmic value of the sensor
(see table below).
If necessary, replace the sensors.
Check the connections to the compressor
(R1), the start-up capacitor pressure
switch and the hot gas valve (T2).
Check the compressor winding resistors.
Check the connection (A4) and correct
positioning of the sensor.
Check the ohmic value of the sensor
(see table below).
If necessary, replace the sensor.
Seek professional assistance.
Warranty