Heat pumps · Error codes · Ideal Heating
385Ideal Heating · Logic Air
385 on an Ideal Heating Logic Air: Low Mains Voltage Fault
Short answer
On an Ideal Heating heat pump, 385 means: Low Mains Voltage Fault. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Low Mains Voltage Fault.
Part involved: mains supply.
Likely causes:
- Low mains supply voltage; local generator not supplying 230 Vac.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
What you can check
- Note the code or fault message shown on the controller/Halo and when it appeared; check the heat pump's isolator and consumer-unit breaker are on. Check whether lights or other appliances are also affected (possible supply problem) and whether any breaker/RCD has tripped - do not reset repeatedly.
What the engineer will check
- Verify supply voltage; if generator in use ensure it supplies 230 Vac; otherwise contact electricity provider.
Who to ask for: Heat pump / heating controls engineer.
Certification: Electrical work by competent person.
Sources
- Logic Air Monobloc Heat Pump System - Installation & Maintenance (UIN 241428 A03) ↗ · UIN 241428 A03 · page 83 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026