H.01-.14 Boiler Fault Code: What It Means on Every Brand

The H.01-.14 fault code appears on 2 boiler brands — Baxi and Remeha — 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.

Engineer may be needed 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 H.01-.14 means	Severity	DIY?
BBaxi	H-codes on Baxi boilers are 'blocking' faults rather than permanent lockouts. Full guide →	Engineer may be needed	Some checks
RRemehashown as H.01.14	The H.01.14 code appears on Remeha boilers when the flow (supply) temperature — the temperature of water leaving the boiler into the central heating circuit — has climbed above the maximum… Full guide →	Engineer may be needed	No

H.01-.14 brand by brand

Baxi H.01-.14

H-codes on Baxi boilers are 'blocking' faults rather than permanent lockouts. The boiler pauses to protect itself but may restart automatically once conditions return to normal, without needing a manual reset. H.01–.14 specifically tells you that the water temperature at the flow sensor has climbed beyond the permitted maximum, most likely because water is not circulating properly around the heating system. Several sub-codes sit within this family and each points to a slightly different aspect of the same underlying problem: H.01.05 means the temperature difference between the flow and return pipes has become too large, suggesting sluggish or blocked circulation; H.01.08 means the flow temperature in heating mode is rising faster than it should, causing the boiler to pause for roughly ten minutes before attempting to restart; H.01.14 (the broadest of the group) confirms the overall maximum flow temperature threshold has been breached. All of these sub-codes share the same root causes and the same diagnostic approach.

Causes, fixes & costs for Baxi H.01-.14 → · All Baxi codes

Remeha H.01.14

The H.01.14 code appears on Remeha boilers when the flow (supply) temperature — the temperature of water leaving the boiler into the central heating circuit — has climbed above the maximum permitted operating threshold. In simple terms, the boiler is overheating because it cannot shed heat into the system fast enough. The 'H' prefix indicates this is a temporary fault: the boiler will usually lock out and may restart once it cools down, but the fault will return unless the underlying cause is fixed. In some cases, H.01.14 can also point to a problem with combustion air discharge or the exhaust pathway, so the flue and fan should not be overlooked during diagnosis.

Causes, fixes & costs for Remeha H.01.14 → · All Remeha codes

Frequently asked questions

Is the H.01-.14 fault code the same on every boiler?

Broadly, yes — on Baxi and Remeha the H.01-.14 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 H.01-.14 fault myself?

On some brands there are safe homeowner checks first — typically system pressure, the condensate pipe in cold weather, and a single reset. The underlying repair usually needs a registered engineer. Never open the boiler casing yourself.

Who should I call about a H.01-.14 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.