Troubleshooting - GRE 777590 Instruction Manual

8. Troubleshooting

8.1 Error code display on LED wire controller
Malfunction
Inlet water temperature
sensor failure
Outlet water temperature
sensor failure
Heating condenser sensor
failure
Gas return sensor failure
Ambient temperature
sensor failure
Temperature difference
between water inlet and
outlet is too much
Cooling outlet water
temperature is too low
First grade antifreeze
protection in Winter
Second grade antifreeze
protection in Winter
Cooling condenser sensor
failure
High pressure protection
Low pressure protection
Flow switch closed
Power supply connections
wrong (for 3 phase unit)
Inlet and outlet water
temperature difference
malfunction
Communication failure
Error code Reason
The sensor in open or short
PP1
circuit
The sensor in open or short
PP2
circuit
The sensor in open or short
PP3
circuit
Connect some wire wrongly on
PP4
this point
The sensor in open or short
PP5
circuit
Water flow volume not
PP6 enough ,water pressure
difference is too low
Water flow volume is not
PP7
enough
Ambient temperature or water
PP7
inlet temperature is too low
Ambient temperature or water
PP7
inlet temperature is too low
Connect some wire wrongly on
PP8
gas return sensor position
1. Refrigerant is too much
EE1
2. Air flow is not enough
1. Refrigerant is not enough
2. Water flow is not enough
EE2
3. Filter jammed or capillary
jammed
Low water flow, wrong flow
EE3 or "ON"
direction, or flow switch failure.
Wrong connection or lack of
EE4
connection
Water flow volume is not
EE5 enough ,water pressure
difference is too low
EE8 Wire connection is not good
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Solution
Check or change the sensor
Check or change the sensor
Check or change the sensor
Confirm there is nothing on this
point, restart the machine
Check or change the sensor
Check the water flow volume or
water jammed or not
Check the water flow or water
system is jammed or not
Water pump will run
automatically for first grade
antifreeze
Heat pump will start heating for
second grade antifreeze
Confirm there is nothing on this
point, restart the machine
1. Discharge redundant
refrigerant from HP gas
system
2. Clean the air exchanger
1. Check if there is any gas
leakage ,re-fill the
refrigerant
2. Clean the air exchanger
3. Replace the filter or
capillary
Check if the water flow is
enough and flow in right
direction, or else the flow
switch could be failed.
Check the connection of power
cable
Check the water flow rate ,or
water system is jammed or not
Check the wire connection