Daikin FTKM18PVMK, Service Manual

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Troubleshooting SiMT041509E
65 Service Diagnosis
4.10 Actuation of High Pressure Switch
Error Code
E3
Method of Error
Detection Abnormality is detected when the contact of the high pressure switch opens.
Error Decision
Conditions
„
High pressure switch (S1PH) activating pressure: 4.15 MPa
„
High pressure switch (S1PH) recovery pressure: 3.2 MPa
Supposed
Causes
„
Actuation of high pressure switch (S1PH)
„
Closed stop valve
„
Disconnection of connector S40
„
Disconnection of 2 terminals of high pressure switch (S1PH)
„
Defective outdoor unit PCB
„
Broken S1PH harness
„
Defective high pressure switch (S1PH)
Troubleshooting
NO
YES
Nearly 0
Ω
Resistance
∞
Check
the resistance
between the pins 1 - 2 on
the connector
S40.
Stop valve open?
Open the stop valve.
Nearly 0
Ω
Resistance
∞
Replace the harness for the high
pressure switch.
Replace the high pressure switch
(S1PH).
Disconnect the connector
S40 from the PCB.
Replace the outdoor unit PCB
(main PCB).
Disconnect the 2 terminals of
the high pressure switch
(S1PH).
NO
YES
High
pressure switch
connector S40 properly
connected?
Reconnect the connector.
Check
the resistance
between the 2
terminals of the high
pressure switch
(S1PH).
(R22435)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.