F24 on a Zhejiang Deye Electrical Appliances Co., Ltd. Deye SUN-SG04LP1-EU single-phase hybrid: PV isolation resistance too low
Short answer
On a Zhejiang Deye Electrical Appliances Co., Ltd. inverter, F24 means: PV isolation resistance too low. The inverter stops until the fault clears or is reset.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: PV isolation resistance too low.
Part involved: PV insulation.
Likely causes:
- PV connection/PE fault.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The inverter stops until the fault clears or is reset.
Resetting itself: yes.
Manual reset: Seek help.
What you can check
- Read the full code and message on the inverter screen or in the Deye Cloud / installer app and note the date/time for your installer.
- Check the inverter's AC isolator next to the inverter and the solar/battery breaker in the consumer unit are ON (do not reset a breaker that trips again - call your installer).
What the engineer will check
- Check PV connections and PE; IR test.
Who to ask for: MCS-certified solar PV installer (DC/string work) or the original installer.
Certification: Work on DC strings and inverter enclosures: competent PV installer (MCS-certified installer for warranty/SEG continuity); electrical work notifiable under Part P (England & Wales) or equivalent.
What you might notice
Sources
- Hybrid Inverter User Manual SUN-3K/3.6K/5K/6K-SG04LP1-EU ↗ · Deye Hybrid Inverter User Manual SUN-3K/3.6K/5K/6K-SG04LP1-EU (file dated 2026-04-27) · page 47 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026