Ideal Turbo2 24 Fault codes & diagnostics

4 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 24 kW 1993-1996 Discontinued

Replaced by: Logic Plus Combi

Download the Ideal Turbo2 24 manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Just want the most common Ideal Turbo2 24 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 4 documented codes

Tap any card for details

Overheat

Your boiler has become too hot and has automatically shut down to prevent damage or safety issues.

High DIY-safe £100-280

What to check first

  1. Check that all radiator valves are open to ensure water can flow through the system.
  2. Wait for the boiler to cool down completely.
  3. Press the reset button once to see if the overheat light clears.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Control Thermostat
Full explanation for Overheat
OVERHEAT NEON

Your boiler has switched itself off because it has become too hot to operate safely.

High DIY-safe £120-280

What to check first

  1. Ensure all radiator valves are fully open
  2. Allow the boiler to cool down for at least 30 minutes
  3. Locate the reset button on the control panel and press it firmly

Parts commonly replaced

  • Circulation pump
  • Overheat thermostat
  • Main heat exchanger (flushing)
Full explanation for OVERHEAT NEON
SUMP FAN FAILURE THERMOSTAT

Your boiler has detected that a safety sensor near the fan or collection area has triggered because it has become too hot or has detected a block.

High Engineer only £140-£280

Parts commonly replaced

  • Sump/Fan Thermostat
  • Main Fan Assembly
  • Venturi Tube
Full explanation for SUMP FAN FAILURE THERMOSTAT
WATER OVERHEAT THERMOSTAT

Your boiler has switched itself off because it got too hot and needs a chance to cool down before it can restart safely.

High DIY-safe £90-250

What to check first

  1. Check that all radiator valves are fully open
  2. Allow the boiler to cool down for at least 20 minutes
  3. Press the reset button on the front of the control panel

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Thermistor
Full explanation for WATER OVERHEAT THERMOSTAT
Status & diagnostic codes

9 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

Air Pressure neon Status Your boiler is signalling that the internal fan system is working correctly and the air pressure is safe for the boiler to fire up. Air Pressure O.K. Status Your boiler is successfully starting a pilot flame, but it is failing to transition to the main burner to provide heat or hot water. AIR PRESSURE OK Status Your boiler has successfully confirmed that the fan is working correctly and the air pressure is safe for the boiler to start. Boiler On Status Your boiler is currently attempting its normal start-up sequence and has successfully confirmed that the safety air flow is working correctly. Boiler On neon Status Your boiler is working normally and is currently heating your water or radiators. Burner On Status Your boiler is operating normally and the burner has successfully lit to provide heating or hot water. Burner On neon / Gas Valve On Status Your boiler is operating normally and the main burner is currently lit to provide heating or hot water. Power On Status Your boiler is receiving electrical power and is switched on, which is normal operating behavior. Power On neon Status This light simply shows that your boiler is receiving electrical power and is ready to operate.