A14 Boiler Fault Code: What It Means on Every Brand

The A14 fault code appears on 2 boiler brands — Andrews and Ferroli — and on all of them it points to the same kind of problem. The details still differ by brand (thresholds, sub-codes, reset procedure), so use the table below to jump to the page for your boiler.

Lockout — engineer likely 2 brands use this code

Which brand is your boiler?

The brand is printed on the front casing. Tap your brand for the full causes, fixes and repair costs.

Brand	What A14 means	Severity	DIY?
AAndrews	On Andrews MAXXflo multi-burner commercial water heaters, fault codes are displayed as a letter paired with a number. Full guide →	Lockout — engineer likely	No
FFerroli	The A14 code appears on Ferroli boilers when the flue extraction duct safety device has been triggered as a result of the F07 fault (high flue gas temperature) occurring three times within… Full guide →	Lockout — engineer likely	No

A14 brand by brand

Andrews A14

On Andrews MAXXflo multi-burner commercial water heaters, fault codes are displayed as a letter paired with a number. The letter indicates the fault category, while the number identifies which burner module is affected. 'A' denotes a lockout fault — the most serious category, meaning the appliance has shut itself down as a safety measure and requires manual intervention before it will restart. '14' identifies burner module 14 as the module that has gone into lockout. The unit will cease firing on that module until the underlying problem is resolved and a reset is carried out. A lockout on any module is typically triggered by repeated flame failures within a single burn cycle, a control communication error between the two internal processors, temperature sensor faults, or too many consecutive user resets. Note: if your Andrews appliance is not a MAXXflo multi-burner unit, 'A14' may carry a different meaning specific to that model — always cross-reference with your own appliance's service manual or contact Andrews Water Heaters directly.

Causes, fixes & costs for Andrews A14 → · All Andrews codes

Ferroli A14

The A14 code appears on Ferroli boilers when the flue extraction duct safety device has been triggered as a result of the F07 fault (high flue gas temperature) occurring three times within a 24-hour period. Rather than a single isolated event, A14 is a cumulative lockout — the boiler is telling you the same dangerous flue temperature condition has repeated itself enough times that it refuses to restart without manual intervention. Ferroli uses 'A' prefix codes to indicate hard lockouts that will not clear on their own; the boiler stays off until someone physically resets it and, crucially, until the underlying problem is resolved. The root fault (F07) points to flue gases not being expelled efficiently, which can create a combustion safety risk — so this lockout should be taken seriously and not bypassed through repeated resets.

Causes, fixes & costs for Ferroli A14 → · All Ferroli codes

Frequently asked questions

Is the A14 fault code the same on every boiler?

Broadly, yes — on Andrews and Ferroli the A14 code points to the same class of fault, and the recommended response is similar. Model-specific details such as sub-codes and reset procedures still vary, so follow the page for your own brand.

Can I fix a A14 fault myself?

Not usually. On every brand listed, A14 points to a fault that needs a suitably registered engineer to diagnose and repair. A single reset to rule out a transient glitch is reasonable; repeated resets are not.

Who should I call about a A14 fault?

For gas boilers, a Gas Safe registered engineer — it is a legal requirement for any work on the appliance. If you smell gas at any point, leave the property and call the National Gas Emergency line on 0800 111 999.

General guidance only — not a substitute for professional advice, and not certified by a registered engineer. Any work on a gas appliance must be carried out by a Gas Safe registered engineer. If you smell gas, call 0800 111 999.