570 on a Vaillant aroTHERM: Fault: Frequency converter switched off

What it means

The manual says: Fault: Frequency converter switched off.

Part involved: Frequency converter switched off.

Likely causes:

• Status/fault state reported by the heat pump; see the corresponding F-code in the fault overview for causes.

Is it safe?

The heat pump keeps running with some functions stopped.

Resetting itself: status changes automatically; the associated F-code (if any) needs reset.

Manual reset: see associated F-code.

What you can check

• Note the full code and text shown on the display (and the date/time it appeared). Check the heat pump supply breaker/isolator (and back-up heater breaker, if separate) at the consumer unit is on; if a breaker has tripped more than once, leave it off and call an engineer - do not open any casing. Do not keep resetting the unit; report the code to your installer (the operating instructions for this product were not checked for a homeowner reset procedure).

What the engineer will check

• Read status in Live Monitor and the fault list; diagnose via the matching F-code (e.g. 580 flow rate -> F.532, 581 -> F.753, 584 -> F.582, 585 -> F.037/F.754, 588 -> F.042, 589 -> F.086, 590 -> F.755).

Who to ask for: Heat pump engineer with electrical competence (qualified electrician for supply/phase faults).

Certification: Competent electrician (BS 7671 / Part P) for supply-side work.

What you might notice

• Heat pump will not start
• No heating
• No hot water

What owners and engineers report

2 owner and engineer reports mention this.

• No heating on the aroTHERM: 2 reports

Sources

• Installation instructions aroTHERM VWL 55/3 A 230 V, VWL 85/3 A 230 V (GB) ↗ · 0020217827_03 · page VWL ../3 A 0020217827_03 p.29; VWL ../2 A 0020147164_09 Appendix D (status codes) · Reviewed 23 September 2026

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 23 September 2026