Aisin AXGP224E1, Technical Manual, Page: 119 / 126

23
WARNING
•
NEVER stop the GHP – AWS system by switching off the power supply during the
operation. Failure to observe this prescription makes the warranty no longer valid and could
result in malfunction and/or damage to the unit.
•
NEVER switch on the YOSHI AWS power supply after switching on the GHP outdoor unit.
Failure to observe this prescription could result in malfunction and/or damage to the unit.
The table below shows all the possible failures indicated directly by the YOSHI AWS control panel.
ALARM TYPE ALARM CODE POSSIBLE CAUSES SOLUTIONS
Flow switch alarm A1S1
•
Y-filter clogged
•
Capacity insufficient
• Clean the Y-filter
•
Check the pressure in the hydraulic
circuit
• Check the flow switch
Pressure difference
switch alarm
A2S1
•
Air in the system
•
Pump malfunction
• Remove the air
•
Replace the pump
•
Check the pressure differential switch
(compare the state with the flow
switch)
GHP1 Alarm A3S1
• Check the code displayed on
the GHP. Press UP for the current
alarms and DOWN for those in
STAN-BY
Flowswitch tamper alarm A4S1
•
Check the wiring of the flowswitch.
• Check the operation of the flowswitch.
• Check the layout of plant (other
pumps make circulate water
when not expected
Antifreeze alarm A5S1
• Check the operation of the pump, the
flow switch and pressure
differential switch
•
Verify that the offset values in summer
operation are not excessive
• Check the temperature probes and
their wiring
Return temperature
probe alarm 1
A6S1 •
Check the probe and the wiring
Antifreeze temperature
probe alarm 1
A7S1
• Check the probe and the wiring
Expansion valve driver
alarm 1
A8S1
• Use the Carel display. Press "help"
and check which component is in
alarm
Maintenance period
warning
A13S1
The heat pump is about to
reach the 10.000 hours of
operation. Need for
routine maintenance.
• Contact the service centre Aisin
12 Troubleshooting (reference)