Instruction manual

EU heat pumps
22
7.3 Overview of possible error codes displayed on the screen
Go back to chapter 5 “Protection systems” for more detailed information.
The heat pump screen displays one of the following codes:
Display
Problem
Cause
Solution
PP1
“WATER IN” sensor out of
order
Sensor open or short-circuited
Check or replace the sensor
PP2
“WATER OUT” sensor out of
order
Sensor open or short-circuited
Check or replace the sensor
PP3
“PIPE” sensor out of order
Sensor open or short-circuited
Check or replace the sensor
PP5
“AIR” sensor out of order
Sensor open or short-circuited
Check or replace the sensor
Insufficient water flow
Check the water flow
PP6
Temperature difference
between “WATER IN” and
“WATER OUT” is too large
Pressure switch out of order
Replace the pressure switch
Insufficient water flow
Check the water flow
PP7
Water temperature too low
during cool-down
Sensor “WATER OUT”
displays an incorrect message
Check or replace the sensor
PP7
First anti-frost protection active
Low temperatures for water
and air
No action required
PP7
Second anti-frost protection
active
Low temperatures for water
and air
No action required
Insufficient water flow
Check the water flow
Pressure switch out of order
Replace the pressure switch
HP
High pressure protection
Too much refrigerant gas
present
Have the heat pump checked by a
refrigeration technician
Not enough refrigerant gas
Have the heat pump checked by a
refrigeration technician
LP
Low pressure protection
Leak in the cooling conduits
Have the heat pump checked by a
refrigeration technician
Insufficient water flow
Check the water flow
FLO
Insufficient water flow
Pressure switch out of order
Replace the pressure switch
Insufficient water flow
Check the water flow
EE5
The temperature difference
between “WATER IN” and
“WATER OUT” has been too
large 3 times in a row
Pressure switch out of order
Replace the pressure switch
EE8
Communication failure
No communication between
the digital display and the
system controller
Check the connection between
the screen and the controller.
Replace screen and/or controller.