Unical ENERPUMP DHW 110, Installation And Service Manual

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Luxury Air Source Heat Pump-Monobloc System 45
timer function invalided.
EE Controller EEPROM
failure
* The error code
disappeared 10 seconds
later, auto restart
function invalided.
1) Chip of controller EEPROM
damaged 1) Replace the chip or replace
the controller
P0 High pressure protection
* The unit stops running. 1) Too small cooling water flow or
a high temperature
2) The uncompressed gas is in
refrigerant system
3) Too much refrigerant
1) Check if the water pump
works in good condition or
readjust water control valve
2) Discharge and then recharge
the refrigerant
3) Discharge some refrigerant.
P1 Low pressure protection
* The unit stops running. 1) Too less refrigerant
2) The electronic expansion valve
assembly damaged
1) Add some refrigerant
2) Replace the electronic
expansion valve assembly
P2 Wrong phase sequence
protection
* The unit stops running. 1) Wrong phase connection (only
for 3 phases power supply) 1) Correct the phase
connection
P3 Absence phases
protection
* The unit stops running.
1) Absence one phase connection
(only for 3 phases power supply) 1) Check if the power supply
cord in open circuit, or if one
wiring loosed off
P4 Water flow switch failure
* The unit stops running. 1) Water pump damaged
2) Too less water in the system
3) Water flow switch damaged 1) Check the water pump, if
needed replace one
2) Check if the water
supplement is ok
3) Check the water flow switch,
if needed replace one
P5 Plate heat exchanger too
low temp. protection
* The unit stops running. 1) Too low ambient temperature
** After E failure, renew the safety by turning the unit ‘OFF’ and back ‘ON’. And P failure will renew automatically
if the failure is eliminated.
*** In case this procedure for resetting the safety is not successful, contact your local dealer.