SiEBE18-526 Troubleshooting for Outdoor Unit
Troubleshooting 295
7.2 Actuation of High Pressure Switch
Remote
Controller
Display
E3
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Abnormality is detected when the contact of the high pressure protection switch opens.
Malfunction
Decision
Conditions
Error is generated when the HPS activation count reaches the number specific to the operation
mode.
Supposed
Causes
Actuation of outdoor unit high pressure switch
Defect of High pressure switch
Defect of outdoor unit PCB
Instantaneous power failure
Faulty high pressure sensor
Troubleshooting
H1: Actuation of high pressure switch (HPS)
• Is the outdoor unit heat exchanger dirty?
• Defect of outdoor fan
• Is the refrigerant over-charged?
• Faulty high pressure sensor
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Operation
is normal when turned
on again by remote
control.
Replace outdoor unit PCB A2P.
Actuation of high pressure switch.
H1
YES
YES
There was an instantaneous
power failure or a past safety
device actuated.
Re-check refrigerant system.
NO
NO
(Q0422)
Contact S1PH is open.
Connect the connector and
operate again.
NO
YES
Are the
HPS connectors
connected to the outdoor main
PCB (A2P)?
H1
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