aquatermic MCO18124D5812-05 Manual Del Usuario página 21

1.6 MALFUNCTIONING OF THE UNIT AND ERROR CODES
When an error occurs or the protection mode is set automatically, the circuit board and the wired controller will both display the
error message.
Protection/
Error code
Malfunction
Standby
Normal running
Lower tank water
temp. sensor failure
Upper tank water
temp. sensor failure
Evaporator coil
temp. sensor failure
Return gas temp
sensor failure
Ambient temp.
sensor failure
Hot Sanitary / Solar
temp. sensor failure
Situation of remote
on/off signal
T6 too high
temp.protection
High pressure
protection (HP
Switch)
Low pressure
protection (LP Switch)
Over heat protection
(T85°C Switch)
Flow switch
Defrosting
Defrost
indicate
Communication
failure
LED indicator
Dark
Bright
☆ ●
P1
(1flash 1 dark)
☆☆
●
P2
(2 flashes 1 dark)
☆☆☆ ●
P3
(3 flashes 1 dark)
☆☆☆☆ ●
P4
(4 flashes 1 dark)
☆☆☆☆☆ ●
P5
(5 flashes 1 dark)
P6 Dark
P7 Dark
P8 Dark
☆☆☆☆☆☆ ●
E1
(6 flashes 1 dark)
☆☆☆☆☆☆☆
E2
(7 flashes 1 dark)
☆☆☆☆☆☆☆☆
E3
(8 flashes 1 dark)
☆☆☆☆☆☆☆☆☆
E5
(9 flashes 1 dark)
☆☆☆☆☆☆☆☆
(all long flashes)
E8 Bright
Possible reasons
1) The sensor open circuit
2) The sensor short circuit
1) The sensor open circuit
2) The sensor short circuit
1) The sensor open circuit
2) The sensor short circuit
1) The sensor open circuit
2) The sensor short circuit
1) The sensor open circuit
2) The sensor short circuit
1) The sensor open circuit
2) The sensor short circuit
When remote signal is on, no P7
will be showed on the controller,
when remote signal is off, P7 will
be displayed. It is not an error
code, but a situation for remote
on/off signal.
1) T6 too high temp.
2) T6 sensor has problem
1) Too high air inlet temp
2) Less water in the tank
3) The electronic expansion valve
assembly blocked
4) Too much refrigerant
5) The HP switch damaged
6) The uncompressed gas is in
refrigerant system
1) Too low air inlet temp
2) The electronic expansion valve
●
assembly blocked
3) Too less refrigerant
4) The LP switch damaged
5) The fan assembly can not work
●
1) Too high tank water temp
2) The T85°C switch damaged
No water flow detected:
1) Pump not powered
●
2) Pump malfunction
3) Dirty water filter
4) Flow switch malfunction
Corrective actions
1) Check the sensor connection
2) Replace the sensor
1) Check the sensor connection
2) Replace the sensor
1) Check the sensor connection
2) Replace the sensor
1) Check the sensor connection
2) Replace the sensor
1) Check the sensor connection
2) Replace the sensor
1) Check the sensor connection
2) Replace the sensor
1) P8 appears at 125°C and disappears at
120°C
2) Check and if it's necessary replace the
sensor
1) Check if the air inlet temp is over the
working limit
2) Check if the tank is full of water. If not,
charge water
3) Replace the electronic expansion valve
assembly
4) Discharge some refrigerant
5) Replace a new switch
6) Discharge and then recharge the refrigerant
1) Check if the air inlet temp is over the
working limit
2) Replace the electronic expansion valve
assembly
3) Charge some refrigerant
4) Replace a new switch
5) Check if the fan working when the
compressor working. If not, some problems
with the fan assembly
1) If the tank water temp is over 85°C, the
switch will open and the e‐heater will stop for
protection. After the water comes to normal
temp, the protection is auto‐reset
2) Replace a new switch
1) Check pump power supply
2) Verify pump electrical connections and
pump rotation. If necessary replace the
pump
3) Clean the filter
4) Check the flow switch contacts and
functioning
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