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Ideal Logic Air fault 9.1.29

No central heating but hot water works OK

Heat pump

What it means

System diagnostic flow for central heating not functioning while hot water production remains normal, indicating a fault isolated to the heating circuit or diverter valve.

Likely causes

  1. Room thermostats not calling for heat
  2. Radiator valves closed
  3. Diverter valve stuck in hot water position
  4. Faulty indoor unit primary PCB
  5. Wiring between Indoor Unit primary PCB and Indoor Unit User Interface PCB not securely connected
  6. Faulty Indoor Unit User Interface PCB
  7. Hot DHW Cylinder target temperature set too low
  8. No 230V supply to the diverter valve

Where to start

  1. Check if room thermostats are calling for heat
  2. Check if radiator valves are open
  3. Check if diverter valve is stuck in hot water position

The full answer, free

  • 7 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 78), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Ideal manual for the Logic Air. Check the model on the data plate before you order parts.

Other Ideal Logic Air fault codes