Ideal Boiler Repair: An Engineer Out Day or Night

Which Ideal boiler faults need an engineer?

Current Ideal boilers such as the Logic split their codes into two families. Codes starting with L are lockouts: the boiler has stopped itself and will wait for a reset. Codes starting with F are faults: some, like low pressure, clear once the cause is fixed, while others point to a failed part. The common ones on Ideal Logic boilers are these.

• F1: water pressure too low. Top up to around 1 to 1.5 bar cold with the filling loop.
• F2: flame lost while running. Often gas supply, the flue or the condensate route.
• F3: fan fault. The fan moves air through the burner and pushes flue gases out.
• F4 and F5: flow or return thermistor, the temperature sensors on the pipework. Some boards show these as L4 and L5, and circulation problems can trigger them too.
• LC: too many restarts in a short time. Switch the boiler off at the fused spur, wait a few seconds and switch it back on.
• L2: ignition lockout. The boiler tried to light and could not.

Codes differ between Ideal ranges and between old and new versions of the same model. The user guide for your model lists its exact codes. Our Ideal fault codes guide covers them one by one.

What can I try before calling an engineer?

For F1, find the filling loop under the boiler, open both valves slowly until the gauge reaches about 1.5 bar, then close them fully. If it drops back below 1 bar within a day or two, there is a leak or a failing expansion vessel, and topping up again only buys time.

For L2 or F2 in cold weather, go outside and find the white or grey plastic condensate pipe leaving the boiler. If it is frozen, pour warm (not boiling) water along it, especially at bends and the open end, then press the restart button once; the user guide shows where it is on your model. If the display is blank, check the fused spur and the consumer unit.

Stop at one reset. Repeated restarts in a short time trip the LC code, and if the lockout comes straight back the fault needs testing. Our guide to boiler ignition lockout explains why repeated resets are not a fix.

Never take the front casing off. If you smell gas, ventilate, turn the gas off at the meter if safe, use no switches, get out, and call the National Gas Emergency Service on 0800 111 999.

What we do on an Ideal boiler visit

We start with the code history, then prove the supply side: gas pressure at the valve, a clear flue terminal outside and an unblocked condensate trap and pipe. For an L2 or F2 that survives those checks, we inspect the ignition and flame-sensing electrodes, which wear and carbon up over time, and the gas valve. For F3 we test the fan and its wiring. For F4 and F5 we check the thermistor readings against the pipe temperatures, and look at the pump and circulation before condemning a sensor.

If the boiler is still inside its manufacturer warranty, speak to Ideal first, because warranty repairs usually have to go through them. Gas work is carried out by Gas Safe registered engineers.

How much does an Ideal boiler repair cost?

The £60 call-out gets an engineer to you at any hour, and the repair price is agreed with you on site before any work starts. As a guide to the wider market, published UK cost guides put a fan replacement at about £200 to £350 and a circuit board at about £350 to £700, parts and labour. Electrodes and condensate trap cleaning usually cost well under that. Those are market figures, not our price list; see pricing for how we charge.

If the boiler is old and the board or heat exchanger has gone, we will tell you plainly whether the repair is worth doing.