LED-A3 on an Ideal Heating Logic Air: Compressor temp. error
Short answer
On an Ideal Heating heat pump, LED-A3 means: Compressor temp. error. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Compressor temp. error.
Part involved: compressor shell temperature.
When it shows: Protection stop by compressor temperature 108C, 2 times within 24 h.
Likely causes:
- 1. Service valve not opened 2. EEV defective/strainer clogged 3. Outdoor unit fan/HX fault 4. Compressor thermistor failure 5. Insufficient refrigerant.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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 the outdoor unit is not blocked by snow, ice, leaves or stored items and that air can flow freely around it.
What the engineer will check
- As for A1 using compressor thermistor; leak test.
Who to ask for: Heat pump engineer; casing removal only by persons competent with R32 (A2L); refrigerant-circuit work requires Cat I/II F-gas certification (I&M p.75 warning).
Certification: F-gas Cat I/II for refrigerant work; electrical work by competent person.
Sources
- Maintenance Manual LOGIC AIR 8-10 Air/water heat pump Monobloc system (U0753484_2451_EN_1) ↗ · U0753484_2451_EN_1 · page 31 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026