AES EFI Series - Page 27

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2. Flow switch failure;
3. Water system block.
2.Check if flow switch is blocked or
damaged;
3.Check if“Y”Shape filter blocked.
3.Clean or change a new filter.
P02
High pressure
protection
1.Water flow is too small
2. High-pressure switch is
damaged;
3.Refrigerant system block
；
4.EEV deadlock.
1.Check if water flow is not enough or
water pump flow is not enough;
2.Check if high-pressure switch is off;
3.Check if refrigerant system is blocked;
4.When heat pump is off and turn the
heat pump on and off to check if EEV
can be listenned by sound of reset.
1.Reinject water or change to a
new pump of larger water flow;
Change a new high-pressure switch;
3.Change a new filter;
4.Change a new EEV
P03
Low pressure
protection
1.Lack of gas;
2.Refrigerant system block
；
3.Exceed heat pump
operation range.
1.Check if gas system is leaking;
2.Check if filter is blocked;
3.Check ambient Temp. and water temp.
is over limitation.
1.Amend the leakage and
reinject the gas;
2.change a new filter.
P04
T3 Coil over heat
protection
1.Heat Pump fan blowing
area is blocked;
2.Evaporator is blocked;
3.T3 coil sensor position
was changed.
1.Check if the blowing area is open;
2.Check if the evaporator is blocked;
3.Check if the coil snesor resistance value
is correct.
1.Put away the blow area;
2.Clean the evaporator;
3.Change a new sensor.
P05
Exhausting gas
temperature
protection
1Lack of gas;
2.sensor position was
changed.
1. Ceheck if refrigerant system is leaking;
2. Check if the snesor resistance value is
correct.
1.Amend the leakage and reinject the
gas;
2.Change a new sensor.
P06
Outlet water
temperature
anti-freezing
protection
1. lower water flow;
2. heat exchanger
blocked;
3. Y-shaped filter blocked
；
4. Overlow load.
1. check if air exists in water system;
2. Plate heat exchanger if blocked;
3. check if Y-shaped filter has block;
4. check design of indoor water system if
reasonable,if have water bypass.
1.If drain valve has problem,change
a new one;
2.Blow plate heat exchanger with
water or high-pressure gas through
reverse direction;
3.Clean Y-shaped filter;
4.Water system must have bypass.
P07
Pipe
temperature
anti-freezing
protection
1. sytem lack of gas;
2. water sytem
has block;
3. cooling system has
block.
1. Check system if any leakage;
2. Check Y-shaped filter has block;
3. Check if cooling system filter has block.
1.Fix leakage and re-charge gas；
2.Clean Y-shaped filter；
2.Change filter.
P08
High-pressue 2
protection
High pressure switch 2
cuts
Check if high pressure switch 2 cuts
under unit OFF condition
Change high pressure switch 2
E01
Controller
communication
failure
Communication
cable cuts
Check communication cable if cut
Change connection cable or
re-connect