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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