LED-AE on an Ideal Heating Logic Air: Low water flow error (no or insufficient water flow rate)
Short answer
On an Ideal Heating heat pump, LED-AE means: Low water flow error (no or insufficient water flow rate). 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: Low water flow error (no or insufficient water flow rate).
Part involved: flow rate sensor / circulation pump.
When it shows: 1 min after pump start, flow below minimum for 10 s continuously; compressor stops.
Likely causes:
- 1. Condenser pump speed too low 2. Water loop closed (radiator valves) 3. Insufficient water pressure 4. Anti-freeze valve opened 5. Valves between indoor and outdoor unit closed 6. Sludge filter trap clogged 7. Circulating pump blocked 8. Flow sensor-PCB connection.
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. Read the heating system pressure gauge (compare it with the pressure your installer set) and report it; check the filling loop is closed.
What the engineer will check
- Read flow rate and pump status on HMI; check water pressure, closed valves, anti-freeze valves, TRVs, filter; check pump speed (parameter 2793); replace pump or flow sensor; replace hydraulic PCB and main 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.
What you might notice
Sources
- Maintenance Manual LOGIC AIR 8-10 Air/water heat pump Monobloc system (U0753484_2451_EN_1) ↗ · U0753484_2451_EN_1 · page 34 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026