In brief
Fault code F5 on Mitsubishi Electric Ecodan PUHZ HW140VHA2 BS PUHZ HW140YHA2 BS Service Manual OC means: Fault code F5 indicates that the circuit of the 63H connector (high-pressure switch) is open. This anomaly is detected if the circuit remains open for 3 consecutive minutes after power-up. Most common cause: The main cause is a disconnection or poor contact of the 63H connector on the outdoor control board, a break in the wiring on the 63H side, a faulty high-pressure switch, or a faulty outdoor control board. First action: Inspect the 63H connector (yellow) on the outdoor control board to ensure it is correctly inserted and not damaged.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).
According to the Ecodan ATW Databook Vol.1 page 61, the F5 code is triggered if the 63H connector circuit remains open for 3 consecutive minutes after power-up.
F5 • Mitsubishi Electric • Ecodan PUHZ HW140VHA2 BS PUHZ HW140YHA2 BS Service Manual OC
Fault Code F5 Mitsubishi Electric: Causes, Diagnosis and Solution
Fault code F5 indicates that the circuit of the 63H connector (high-pressure switch) is open. This anomaly is detected if the circuit remains open for 3 consecutive minutes after power-up.
Source: Mitsubishi Electric documentation (service manual – according to product reference)
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What does fault code F5 on Mitsubishi Electric mean?
Fault code F5 indicates that the circuit of the 63H connector (high-pressure switch) is open. This anomaly is detected if the circuit remains open for 3 consecutive minutes after power-up.
The main cause is a disconnection or poor contact of the 63H connector on the outdoor control board, a break in the wiring on the 63H side, a faulty high-pressure switch, or a faulty outdoor control board.
Symptômes
- Display of fault code F5 when the unit starts up.
- Alert message indicating that the 63H connector (yellow) is open.
- Heat pump shutdown or malfunction due to high-pressure safety.
- No normal operation of the heating or cooling system.
Diagnostic
1. Check the 63H Connector
- Inspect the 63H connector (yellow) on the outdoor control board to ensure it is correctly inserted and not damaged.
- Check the connection of the 63H connector on the outdoor control board by referring to the Test Point Diagram.
2. Check Wiring and Continuity
- Check the wiring side of the 63H connection for any break or poor contact.
- Measure the continuity of the high-pressure switch (63H) with a tester to confirm its electrical state.
How to reset fault code F5 on Mitsubishi Electric?
If the 63H connector connection is correct but the circuit remains open, check the wiring continuity. If the wiring is intact, replace the high-pressure switch if it is faulty. As a last resort, replace the outdoor control board if no problem is found with the connector, wiring, or switch.
When should you call an F-Gas engineer?
This code appears during system startup if the high-pressure switch (63H) circuit does not close within 3 minutes of power-up. It indicates a physical or electrical interruption preventing the outdoor control board from detecting high pressure.
Affected models
- PUHZ HW140VHA2 BS
- PUHZ HW140YHA2 BS
- PUHZ W50VHA BS
- PUHZ SW50VKA BS
Field context
This code appears during system startup if the high-pressure switch (63H) circuit does not close within 3 minutes of power-up. It indicates a physical or electrical interruption preventing the outdoor control board from detecting high pressure.
Technical source data
The F5 code signals an open circuit on the 63H connector (high-pressure switch, yellow) detected after 3 consecutive minutes of operation. Causes include a disconnected connector on the outdoor control board, a break in the wiring on the 63H side, a faulty switch, or a faulty control board. The diagnostic procedure requires checking the connector insertion, wiring continuity, and switch functionality before concluding a board fault. (Sources: Ecodan ATW Databook Vol.1 p.61, Ecodan ATW PUHZ W50VHA BS Service p.14, Ecodan PUHZ SW50VKA BS Service Manual p.20, Ecodan PUHZ HW140VHA2 BS Service Manual p.54 and p.86)
Sources: Ecodan ATW Databook (PUZ WZ) Vol.1 .0 — ecodan-atw-databook-puz-wz-vol-1-0.pdf (p. 61) · Ecodan ATW PUHZ W50VHA BS Service — ecodan-atw-puhz-w50vha-bs-service.pdf (p. 14) · Ecodan PUHZ SW50VKA BS Service Manual OCH525C — ecodan-puhz-sw50vka-bs-service-manual-och525c.pdf (p. 20)
Questions fréquentes
What is the time threshold for triggering fault code F5?
Fault code F5 is triggered if the circuit of the 63H connector (high-pressure switch) remains open for 3 consecutive minutes after the unit is powered on. This delay confirms that the opening is not temporary but constitutes a persistent circuit anomaly.
What is the first diagnostic step for an F5 code?
The first step is to check the physical connection of the 63H connector on the outdoor control board. Ensure it is correctly inserted, not damaged, and that contact is established, referring to the test point diagrams specific to the model (e.g., section 9-6 or 10-9).
How do you distinguish between a wiring fault and a switch fault?
After confirming the connector is properly plugged in, check the continuity of the wiring on the 63H side. If the wiring is intact, perform a continuity test on the high-pressure switch itself. If the switch is faulty, it must be replaced; if both wiring and switch are good, the outdoor control board is suspected.
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