Ideal F2 fault code: flame loss explained

What does the Ideal F2 fault code mean?

Ideal's own fault-code list defines a flashing F and 2 as a "Flame Loss / Ignition Lockout". In plain terms, the boiler either tried to light and the flame didn't catch, or it was running and the flame went out mid-cycle. The control board picks this up through the flame sensor and locks the boiler out rather than let unburned gas escape.

F2 shows on the Ideal Logic Heat and Logic+ Heat ranges, covered in Ideal's own troubleshooting manuals for those models. It isn't a gas emergency in itself (the lockout is the safety system doing its job), but it does need sorting, and some of the checks are safely yours to make before you call anyone.

Key facts

The quick version before the detail.

• What it means: flame loss or ignition lockout, the flame failed to establish or went out while running.
• Models: confirmed on Ideal Logic Heat and Logic+ Heat, per Ideal's own troubleshooting manuals.
• DIY checks: reset once, check other gas appliances, check the yellow gas isolation valve is on, check prepayment meter credit.
• Gas Safe job if: the fault returns after one reset, or it's the gas valve, fan, flue, electrode or PCB.
• F2 and L2 are related: same flame-loss/ignition-lockout family, but not identical (see below).
• Smart Plan boiler & central heating cover: parts and labour up to £500 a year if the boiler is under 7 years old, or up to £200 a year if it is over 7.
• A £95 call-out fee, paid in advance, applies in your first 30 days, for faults the plan does not cover, if the engineer cannot get access, and for early annual-service requests.
• Cover-plan call-outs run Monday to Friday, 08:00-18:00. Outside those hours you are only seen sooner for a genuine emergency breakdown, so a Friday-evening or weekend fault can wait until Monday.
• Using a module starts a 12-month agreement period the first time you use a service. There is a 14-day cooling-off period, but it ends once a service is carried out, and leaving early after that costs the remaining months or 75% of the outstanding balance.

Why does the F2 code appear?

F2 points at the flame itself rather than one single part, so the underlying cause can be several different things. Ideal's own guidance ranks a gas supply interruption, such as a prepayment meter that has run out of credit or a meter valve left off, as the most likely cause. After that, a faulty or stuck gas valve, a faulty fan or the wrong fan speed, a flue blockage, and low or incorrect gas pressure are all common.

In cold weather, a frozen condensate pipe can also stop the boiler firing properly; Ideal's manual raises this under the closely related L2 code, and engineers report it against F2 too. A cracked or sooted spark electrode, or a damaged ignition lead, can also stop the flame catching in the first place.

The table below runs through the likely causes and who can safely deal with each one.

F2 causes and who fixes them

Can I fix an Ideal F2 myself?

There are a few safe checks you can make before booking anyone, all drawn from Ideal's own guidance. None of them involve opening the boiler casing or touching the gas valve, fan or flue internals: that's the line you never cross. Work through them in this order.

1. Check your other gas appliances. If your hob or gas fire won't work either, the problem is the gas supply, not the boiler.

2. If you're on a prepayment meter, check it has credit. A meter that has run down will shut off the gas to the boiler.

3. Find the yellow gas isolation valve under the boiler and check it's fully on.

4. Listen as the boiler tries to fire. If you hear gurgling, that can point to a blockage, so contact an engineer rather than resetting again.

5. You can check the outside flue terminal isn't visibly blocked, but don't attempt to clear it yourself.

6. Reset the boiler once, following the steps in your Ideal manual. Reset only once.

Stop there. Anything involving the gas valve, fan, flue internals, spark electrode, gas pressure or the control board is Gas Safe registered engineer work, and boilercentral notes it plainly: this isn't a DIY repair. If F2 comes back after these checks, Ideal's own guidance is to call quoting Error Code F2 rather than reset again.

Is F2 the same as L2?

Not quite. Ideal's own fault-code page gives F2 and L2 near-identical wording, both describing flame loss or ignition lockout, and Ideal doesn't draw a hard line between the two. They belong to the same flame-loss family.

The distinction that does exist, per Ideal's Logic Heat manual, is timing: F2 tends to mean the boiler was running and lost its flame mid-cycle, while L2 tends to mean it failed to ignite at all on start-up. In practice the checks and the engineer-only boundary are the same either way, so if you're not sure which code is showing, treat it the same way you would F2.

When to call a Gas Safe registered engineer

If the gas isolation valve is on, the meter has credit and your other gas appliances are working but F2 keeps coming back after one reset, it needs a Gas Safe registered engineer. Ideal's own guidance is direct: if the checks don't clear it, call quoting Error Code F2. This is specialist, legally restricted work covering the gas valve, fan, flue, electrode and gas pressure, not a DIY job.

A flame-loss fault can turn out to be anything from a straightforward reset to a gas valve, fan or flue repair, so the parts and labour involved can vary a good deal. That's worth weighing against how you'd rather cover it: a one-off repair or an ongoing module.

You can book a one-off repair with us and a Gas Safe registered engineer will come and check it, or call us on 0333 772 6247. A Smart Plan boiler and central heating module covers parts and labour up to £500 a year if your boiler is under 7 years old, or up to £200 a year if it's over 7. Cover is modular, so you only pick what you want.

A few things worth knowing before you set up cover. A £95 call-out fee, paid in advance, applies in your first 30 days, for faults the plan doesn't cover, if the engineer can't get access, and for early annual-service requests. Cover-plan call-outs run Monday to Friday, 08:00-18:00; outside those hours you're only seen sooner for a genuine emergency breakdown as set out in your terms, so a fault on a Friday evening or over the weekend can wait until Monday. And using any module starts a 12-month agreement period from the first time you use a service - there's a 14-day cooling-off period, but it ends the moment a service is carried out, and leaving early after that costs the remaining months or 75% of the outstanding balance.

Smart Plan is a service plan, not insurance. In plain terms, it's a membership that arranges and funds covered repairs up to the limits on your plan, rather than a regulated financial product - it doesn't pay out a cash sum, and cover is limited to the modules you've chosen and the limits set out in your terms. It's provided by UK Boiler Company Ltd, which has traded since 2014 and looked after over 15,000 customers.

One safety note: F2 is combustion and gas-safety related, which is why the boiler locks out rather than keep trying. If you ever smell gas or suspect carbon monoxide, don't wait for an engineer - call the National Gas Emergency Service on 0800 111 999 straight away.

Ideal F2 fault code FAQs

Seeing F2 keep coming back? We'll come and fix it for you.

Book a one-off repair and a Gas Safe registered engineer will check the gas supply, valve, fan and flue, or set up a Smart Plan boiler and central heating module so covered repairs are handled up to your cover limit - up to £500 a year for a boiler under 7 years old, or up to £200 a year if it's older. It's a service plan, not insurance, so it funds covered repairs rather than paying out a cash sum. A £95 call-out fee, paid in advance, applies in your first 30 days, for faults the plan doesn't cover, no-access visits and early annual-service requests. Cover-plan call-outs are Monday to Friday, 08:00-18:00 unless it's a genuine emergency. Using a module starts a 12-month agreement period once you first use a service; leaving early costs the remaining months or 75% of the outstanding balance.

Helpful links

• Ideal boiler fault codes
• Ideal F1 fault code
• Ideal L1 fault code
• Ideal Heating help hub
• Boiler not working? Book a repair
• Boiler & central heating cover
• Check an engineer on the Gas Safe Register