Duratech EU - series - Troubleshooting guide

EU heat pumps
20
Problem: 
the heat pump doesn’t work
Observation: 
the screen does not light up and the fan/compressor doesn’t make a sound
Possible cause
Solution
No electrical power supply
Check power supply (wiring, fuses, ...)
Problem: 
the heat pump doesn’t work
Observation: 
the screen displays “OFF” and the LED next to “ ” is not lit
Possible cause
Solution
The pump is in stand-by mode
Turn on the pump
Problem: 
the heat pump doesn’t work
Observation: 
the screen displays “OFF” and the LED next to “ ” is lit
Possible cause
Solution
1. The set temperature has been reached
1. No action required; all is well
2. The heat pump isn’t functioning yet
2. Wait until the start time delay period has lapsed (3
minutes)
Problem: 
the heat pump works but doesn’t heat
Observation: 
the compressor is running but the fan isn’t and the “HEATING/DEFROST” LED is blinking
Possible cause
Solution
The defrosting cycle is running
No action required; all is well
Problem: 
the heat pump works normally but there is no or insufficient heating
Observation: 
the screen displays the temperature but no error codes
Possible cause
Solution
1. Insufficient capacity of the heat pump in proportion to
the size of the swimming pool
 Install a larger sized model or an extra heat pump.
Cover the pool to limit heat loss
2. The compressor works but the fan doesn’t
 Check the electrical wiring of the fan. Replace the
condenser or the fan motor if necessary.
3. The fan works but the compressor doesn’t
 Check the electrical wiring of the compressor. Replace
the condenser or the compressor if necessary.
4. The heat pump has not been placed on an optimal
location
 Make for sufficient air circulation (see manual for
details)
5. Faulty temperature setting
 Set the correct temperature
6. By-pass not adjusted
 Have the by-pass readjusted by the installer
7. Massive ice formation on the evaporator
 Have the settings for automatic defrost control checked
by the installer
8. Not enough refrigerant
 Have the heat pump checked by a refrigeration
technician
Problem: 
the heat pump works normally but the water is cooling down instead of heating up
Observation: 
the screen displays the temperature but no error codes
Possible cause
Solution
 The wrong mode has been selected
 Verify the parameters, select the correct mode
 The controller is out of order
 Check the voltage in the electrical wiring to the 4-way
valve. If no electric potential is measured, replace the
controller
 The 4-way valve is out of order
 Check the voltage in the electrical wiring to the 4-way
valve. If electric potential is measured, replace the coil.
If the problem persists, have the heat pump checked by
a refrigeration technician