LED-86-HP-switch on an Ideal Heating Logic Air: High pressure switch error
Short answer
On an Ideal Heating heat pump, LED-86-HP-switch means: High pressure switch 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: High pressure switch error.
Part involved: high pressure switch (P770).
When it shows: At power-on, high pressure switch detected open.
Likely causes:
- 1. HP switch connector disconnected/open 2. HP switch characteristic failure 3. Inverter PCB failure.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| 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.
What the engineer will check
- Check HP switch connector/cable; check switch characteristic (opens 4.2 +/-0.1 MPa, closes 3.2 +/-0.15 MPa); replace inverter PCB.
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 24 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026