Common problems guide

The most common Ideal Turbo2 24 problems

The faults most likely to send a Ideal Turbo2 24 into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
16 documented codes
6 most common
4 DIY-safe checks
2 engineer needed

The 6 most common faults

01
Overheat High DIY-safe

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

What to try first

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

Est. cost
£100-280
Parts
Overheat Thermostat, Circulation Pump, Control Thermostat
Full guide for Overheat
02
OVERHEAT NEON High DIY-safe

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

What to try first

Ensure all radiator valves are fully openAllow the boiler to cool down for at least 30 minutesLocate the reset button on the control panel and press it firmly

Est. cost
£120-280
Parts
Circulation pump, Overheat thermostat, Main heat exchanger (flushing)
Full guide for OVERHEAT NEON
03
WATER OVERHEAT THERMOSTAT High DIY-safe

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

What to try first

Check that all radiator valves are fully openAllow the boiler to cool down for at least 20 minutesPress the reset button on the front of the control panel

Est. cost
£90-250
Parts
Overheat Thermostat, Circulation Pump, Thermistor
Full guide for WATER OVERHEAT THERMOSTAT
04
Condensate Drain Blockage High DIY-safe

Liquid waste produced by the boiler is not draining away properly, which has caused the system to switch itself off for safety.

What to try first

Check the white plastic pipe exiting the boiler to see if it is blocked or disconnected.If the pipe runs outside, check if the end of the pipe is frozen and pour warm (not boiling) water over it to melt the ice.Ensure the internal condensate trap is not full of debris and can be cleared if accessible without opening the sealed boiler casing.

Est. cost
£90-160
Parts
Condensate trap, Condensate pipework, Internal siphon
Full guide for Condensate Drain Blockage
05
Air Pressure O.K. High Engineer

Your boiler is successfully starting a pilot flame, but it is failing to transition to the main burner to provide heat or hot water.

Est. cost
£120-280
Parts
Main Gas Valve, Control Box, Solenoid Coil
Full guide for Air Pressure O.K.
06
Flue gas overheat High Engineer

Your boiler has switched itself off because the internal gases have become too hot, which could damage the heat exchanger or seals.

Est. cost
£150-£650
Parts
Flue Gas Overheat Thermostat, Main Heat Exchanger, Thermistor
Full guide for Flue gas overheat

on the Ideal Turbo2 24

Overheat ThermostatCirculation PumpControl ThermostatCirculation pumpOverheat thermostatMain heat exchanger (flushing)

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Ideal shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue
See the full 16-code list for the Ideal Turbo2 24