OVERHEAT-PROTECTION on an Aira Heat Pump: Overheating protection activates to protect the indoor unit from damaging heat levels; must be physically reset after the incident is solved
Short answer
On an Aira heat pump, OVERHEAT-PROTECTION means: Overheating protection activates to protect the indoor unit from damaging heat levels; must be physically reset after the incident is solved. The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Overheating protection activates to protect the indoor unit from damaging heat levels; must be physically reset after the incident is solved.
Part involved: indoor unit overheating protection (limit 90 C) and reset button.
When it shows: Temperature limit for over-heating protection 90 C (product data).
Likely causes:
- Excessive temperature in indoor unit (immersion/electric heater circuit).
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: no.
Manual reset: Reset button under a cover inside the indoor unit - technician only (covers must be removed).
What you can check
- Contact Aira customer support; do not remove covers.
What the engineer will check
- Find cause of overheat (immersion control, sensors, flow), then remove cover(s) and press the overheating protection reset button (250L: lower front cover; 100L: remove electrical box per s.7.3.3-7.3.4).
Who to ask for: Aira-employed Clean Energy Technician (R290 heat pump).
Certification: Aira-trained/licensed technician; R290 flammable refrigerant competence for refrigerant work.
What you might notice
Sources
- Aira Indoor Unit (100L/250L) Installation Manual, 1.0 ↗ · 1.0 · page pp.39-40 (s.9.3.2); 1.5 manual p.40; Compact manual p.38 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026