57 on a Hitachi heat pump: Fan motor protection - abnormality of fan motor protection (DC fan motor)
Short answer
On a Hitachi heat pump, 57 means: Fan motor protection - abnormality of fan motor protection (DC fan motor). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 2 sources
What it means
On the Yutaki H / H Combi (R32 hydrosplit)
The manual says: Fan motor protection - abnormality of fan motor protection (DC fan motor).
Part involved: outdoor DC fan motor.
Likely causes:
- Fan motor fault or locked fan.
On the Yutaki M (RASM monobloc)
The manual says: Fan motor protection - abnormality of fan motor protection (DC fan motor).
Part involved: outdoor DC fan motor.
Likely causes:
- Fan motor fault or locked fan.
On the Yutaki M (RHUE, 1st generation)
The manual says: Abnormality of fan motor protection.
On the Yutaki S (split air-to-water)
The manual says: Fan motor protection - abnormality of fan motor protection (DC fan motor).
Part involved: outdoor DC fan motor.
Likely causes:
- Fan motor fault or locked fan.
On the Yutaki S80 (high-temperature cascade split)
The manual says: Fan motor protection - abnormality of fan motor protection (DC fan motor).
Part involved: outdoor DC fan motor.
Likely causes:
- Fan motor fault or locked fan.
Is it safe?
On the Yutaki H / H Combi (R32 hydrosplit)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
No need to switch off — call an engineer if it comes back.
Resetting itself: no.
Manual reset: Stop the unit (via unit controller / power off-on) after the cause is fixed.
On the Yutaki M (RASM monobloc)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
No need to switch off — call an engineer if it comes back.
Resetting itself: no.
Manual reset: Stop the unit (via unit controller / power off-on) after the cause is fixed.
On the Yutaki M (RHUE, 1st generation)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
No need to switch off — call an engineer if it comes back.
Resetting itself: unknown.
Manual reset: Power OFF/ON to remove alarms in Yutaki M and system controller (TCGB0090 p.141 for F16/F17).
On the Yutaki S (split air-to-water)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
No need to switch off — call an engineer if it comes back.
Resetting itself: no.
Manual reset: Stop the unit (via unit controller / power off-on) after the cause is fixed.
On the Yutaki S80 (high-temperature cascade split)
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
No need to switch off — call an engineer if it comes back.
Resetting itself: no.
Manual reset: Stop the unit (via unit controller / power off-on) after the cause is fixed.
What you can check
- Read and note the alarm code and any retry code (e.g. P70) shown on the unit controller.
- Check the heat pump supply breaker/isolator at the consumer unit is ON.
- Restart once via the unit controller (or switch off/on at the isolator) - the manual states the unit must be stopped to release most alarms; if the code returns, call an engineer.
- Check the outdoor unit is not blocked by snow, ice, leaves or debris and airflow around it is clear.
What the engineer will check
- Follow SMGB0146 section 6.7 troubleshooting flowchart for alarm 57.
- Check fan motor runs freely and its connector/wiring.
- Check fan controller/inverter PCB.
Who to ask for: Heat pump service engineer.
Certification: Competent electrical worker.
What you might notice
Sources
- Service Manual - YUTAKI R32 / R410A series (Split, Monobloc and Hydrosplit systems) ↗ · SMGB0146 rev.0 - 12/2022 · page table printed p.655 (viewer p.681); troubleshooting flowchart printed p.719-720 (viewer p.745-746) · Reviewed 23 September 2026
- YUTAKI M Series RHUE-3AVHN1 / RHUE-(3-6)A(V)HN-HM Technical Catalogue ↗ · TCGB0090 rev.0 - 12/2013 · page p.139 (PDF p.147) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026