Heat pumps · Error codes · Ideal Heating
10Ideal Heating · Logic Air
10 on an Ideal Heating Logic Air: Outside Sensor Fault
Short answer
On an Ideal Heating heat pump, 10 means: Outside Sensor 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: Outside Sensor Fault.
Part involved: outdoor air sensor (QAC34).
Likely causes:
- Outside sensor wiring loose/disconnected; outside sensor out of resistance tolerance; RVS21 PCB fault.
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. If the fault clears after the installer-approved restart via the controller and does not return, note it for the next service; if it returns, call an engineer.
What the engineer will check
- Check wiring from indoor unit outside-sensor terminals to sensor at both ends; disconnect and measure sensor resistance (manual: 940 ohm at 5C, 970 ohm at 20C); replace sensor or RVS21 PCB.
Who to ask for: Heat pump / heating controls engineer.
What you might notice
Sources
- Logic Air Monobloc Heat Pump System - Installation & Maintenance (UIN 241428 A03) ↗ · UIN 241428 A03 · page 76 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026