Ideal Logic Air fault 9.1.28

What it means

Heat pump has exceeded the permitted number of starts, typically caused by short-cycling due to pipework blockages or incorrectly sized circuits.

Likely causes

1. Blockage in pipework between Indoor and Heat Pumps
2. Heating and Hot Water circuits not correctly sized
3. Blockage in internal pipework
4. Dwelling ambient temperature at or below 8°C
5. Ambient air temperature at or below 1°C
6. Dwelling room temperature dropped to ≤8°C

Where to start

1. Check for blockage in pipework between Indoor and Heat Pumps
2. Check Heating and Hot Water circuits are correctly sized
3. Check for blockage in internal pipework