fluidra 74143, Owner'S Manual, Page: 29 / 276

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7. Troubleshooting
7.1 Error code display on LED wire controller
Malfunction Error
code
Reason Solution
Low ambient temperature protection PP0 Ambient temperature is
too low
Inlet water temperature sensor failure PP1 The sensor in open or
short circuit
Check or change the sensor
Outlet water temperature sensor
failure PP2 The sensor in open or
short circuit
Check or change the sensor
Heating condenser sensor failure PP3 The sensor in open or
short circuit
Check or change the sensor
Gas return sensor failure PP4 The sensor in open or
short circuit
Check or change the sensor
Ambient temperature sensor failure PP5 The sensor in open or
short circuit
Check or change the sensor
Temperature difference too much
protection water inlet and outlet PP6 Water flow volume is not
enough
Check the water flow volume
or water jammed or not.
First grade antifreeze protection in
Winter PP7 Ambient temperature or
water inlet temperature is
too low Water pump will run
automatically for first grade
antifreeze
Second grade antifreeze protection in
Winter
PP7 Ambient temperature or
water inlet temperature is
too low
Heat pump will start heating
for second grade antifreeze
High pressure protection EE1 1. Refrigerant is too
much
2. Air flow is not enough
1. Discharge redundant
refrigerant from HP gas
system
2. Clean the air exchanger
Low pressure protection EE2 1. Refrigerant is not
enough
2. Water flow is not
enough
3. Filter jammed or
capillary jammed
1. Check if there is any gas
leakage, re-fill the
refrigerant
2. Clean the air exchanger
3. Replace the filter or
capillary
Flow switch closed ON /EE3 Low water flow, wrong
flow direction, or flow
switch failure.
Check if the water flow is
enough and flow in right
direction, or else the flow
switch could be failed.
Inlet and outlet water temperature
difference malfunction
EE5 Water flow volume is not
enough, water pressure
difference is too low
Check the water flow rate or
water system is jammed or
not
Communication failure EE8 Wire connection is not
good
Check the wire connection