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7. SYSTEM PROTECTIONS/ ERROR CODES
When an error occurs or the protection mode is set automatically, the wired controller will display an
error code as below.
Code
Failure
Possible reasons
Remedy
Er01
Phase dislocation
Wrong connection of live wires
1) Reverse position of 2 live
wires(3-Phase units only).
Er02
Phase loss
Live wires loose or without power
1) Check if live wires loose or
without power
(3-Phase units only).
Er03
Water flow switch failure
1) Inadequate water flow
2) Water flow switch damaged
3) Main PCB damaged
1) Check the pump
2) Replace the water flow
switch
3) Replace the PCB
Er04
Anti-freeze protection in winter
This function occurs when
ambient temp is too low.
No action needed
Er05
High pressure protection
1) Inadequate flow rate
2) Uncompressed
gas
in
refrigerant system
3) Overcharge with refrigerant
4) Water temp setting too high
5) Poor connection of pressure
switch
6) Pressure switch failure
7) Main PCB damaged
1) Check pump and water
control valve
2) Discharge
and
then
recharge the refrigerant
3) Discharge some refrigerant
4) Set lower water temp
5) Reconnect the switch
6) Replace
the
pressure
switch
7) Replace the PCB
Er06
Low pressure protection
1) Undercharged refrigerant
2) Capillary block
3) Poor connection of pressure
switch
4) Pressure switch failure
5) Main PCB damaged
1) Add some refrigerant
2) Replace the capillary
3) Reconnect the switch
4) Replace
the
pressure
switch
5) Replace the PCB
Er09
Communication failure
The control pad and PCB
connection failure
Check the wire connection
Er12
Over-high compressor exhaust gas
temp protection
1) Refrigerant Undercharged
2) Possible reasons as Er05
1) Add some refrigerant
2) Similar corrections as Er05
Er15
Inlet
water temp sensor failure
1) Sensor open circuit
2) Sensor short circuit
3) Main PCB damaged
1) Check
the
sensor
connection
2) Replace the sensor
3) Replace the main PCB
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Automated Environmental Systems Ltd., Unit 1, 1 Wimbledon Avenue, Brandon, Suffolk IP27 0NZ
01842 819130 | [email protected]
