Daikin R407C PLUS - Outdoor Unit: Actuation of High Pressure Switch

Si33-105 Troubleshooting
Troubleshooting R407C PLUS Series Heat Recovery System 171
3.15 Outdoor Unit: Actuation of High Pressure Switch
Remote
Controller
Display
E3
Supposed
Causes
!
Actuation of outdoor unit high pressure switch
!
Defect of outdoor unit PC board (A1P)
!
Instantaneous power failure
!
Stop valve closes
Troubleshooting
"
1: Actuation of high pressure switch (HPS)
The outdoor unit PC board’s connector is disconnected.
Is the outdoor unit heat exchanger dirty?
Defect of outdoor fan
Is the refrigerant over-charged?
Is the stop valve closed?
Operation is
normal when turned on
again by remote
controller.
Replace outdoor unit PC board A1P.
Actuation of high pressure switch. H 1
YES
YES
There was an instantaneous power
failure or a past safety device
actuated. Re-check refrigerant
system.
NO
NO
(VF041)
Contact
S1HP (X10A) or S2HP
(X11A) is open.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.