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8. Troubleshooting
8.1 Error codes shown on the controller with LED display
Fault
Cable
controller
Cause
Solution
Defect to the temperature sensor for
incoming water
PP1
The sensor is either open or
short-circuited.
Check or replace the sensor.
Defect to the temperature sensor for
outgoing water
PP2
The sensor is either open or
short-circuited.
Check or replace the sensor.
Defect to the sensor for capacitor
heating
PP3
The sensor is either open or
short-circuited.
Check or replace the sensor.
Defect to the sensor for returned gas
PP4
The sensor is either open or
short-circuited.
Check or replace the sensor.
Defect to the sensor for ambient
temperature
PP5
The sensor is either open or
short-circuited.
Check or replace the sensor.
Too large temperature difference
between the inlet and outlet of water
PP6
Insufficient water flow or too
low pressure difference.
Check the volume of water flow
and whether or not the water
passes through.
Too low temperature of outgoing
cooling water
PP7
Insufficient water flow
Check the volume of water flow
and whether or not the water
passes through.
First stage of the frost protection
system
PP7
The ambient temperature or the
temperature of incoming water
is too low.
The pump will run
automatically during the first
stage of the frost protection
system.
Second stage of the frost protection
system
PP7
The ambient temperature or the
temperature of incoming water
is too low.
The heat pump will start heating
during the second stage of the
frost protection system.
Defect to the sensor for cooling
capacitor
PP8
The sensor is either open or
short-circuited
Check or replace the sensor.
Protection against high pressure
EE1
1. Too much coolant
2. Insufficient air flow
1. Remove the excess coolant
from the heat pump system.
2. Clean the air exchanger.
Protection against low pressure
EE2
1. Lack of coolant
2. Insufficient flow
3. Clogged filter or capillary
tubes
1. Check the gas for leakage,
add the coolant.
2. Clean the air exchanger.
3. Change the filter or replace
the capillary tubes.
Defect to the sensor for water flow
EE3
No water / lack of water
Check the volume of water flow
and the pump.
Wrong power supply connection
(for 3-phase unit)
EE4
Wrong or incorrect connection
Check the connection and
power supply cable.
Inlet and outlet temperature
difference error
EE5
Insufficient water flow or too
low pressure difference
Check the volume of water flow
and whether or not the water
passes through.
Communication error
EE8
Wrong connection of cables
Check the connection of cables.
EN
