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8. Troubleshooting
8.1 Error codes shown on the controller with LED display
Fault
Defect to the temperature sensor for
incoming water
Defect to the temperature sensor for
outgoing water
Defect to the sensor for capacitor
heating
Defect to the sensor for returned gas
Defect to the sensor for ambient
temperature
Too large temperature difference
between the inlet and outlet of water
Too low temperature of outgoing
cooling water
First stage of the frost protection
system
Second stage of the frost protection
system
Defect to the sensor for cooling
capacitor
Protection against high pressure
Protection against low pressure
Defect to the sensor for water flow
Wrong power supply connection
(for 3-phase unit)
Inlet and outlet temperature
difference error
Communication error
Cable
Cause
controller
The sensor is either open or
PP1
short-circuited.
The sensor is either open or
PP2
short-circuited.
The sensor is either open or
PP3
short-circuited.
The sensor is either open or
PP4
short-circuited.
The sensor is either open or
PP5
short-circuited.
Insufficient water flow or too
PP6
low pressure difference.
PP7
Insufficient water flow
The ambient temperature or the
PP7
temperature of incoming water
is too low.
The ambient temperature or the
PP7
temperature of incoming water
is too low.
The sensor is either open or
PP8
short-circuited
1. Too much coolant
EE1
2. Insufficient air flow
1. Lack of coolant
2. Insufficient flow
EE2
3. Clogged filter or capillary
tubes
EE3
No water / lack of water
EE4
Wrong or incorrect connection
Insufficient water flow or too
EE5
low pressure difference
EE8
Wrong connection of cables
20
Solution
Check or replace the sensor.
Check or replace the sensor.
Check or replace the sensor.
Check or replace the sensor.
Check or replace the sensor.
Check the volume of water flow
and whether or not the water
passes through.
Check the volume of water flow
and whether or not the water
passes through.
The pump will run
automatically during the first
stage of the frost protection
system.
The heat pump will start heating
during the second stage of the
frost protection system.
Check or replace the sensor.
1. Remove the excess coolant
from the heat pump system.
2. Clean the air exchanger.
1. Check the gas for leakage,
add the coolant.
2. Clean the air exchanger.
3. Change the filter or replace
the capillary tubes.
Check the volume of water flow
and the pump.
Check the connection and
power supply cable.
Check the volume of water flow
and whether or not the water
passes through.
Check the connection of cables.
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