Flint
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Everyone
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10+
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About this app
Every boiler's service intelligence in your pocket.
Flint puts manuals, fault codes and structured service data for 1,000+ UK boiler models one search away — built for Gas Safe engineers who need answers on site, not after a trawl through PDFs.
FIND THE BOILER FAST
Search by model name, range or GC number. Recent boilers stay one tap away.
FAULT CODES THAT EXPLAIN THEMSELVES
50,000+ fault codes with plain-English causes, severity and the parts commonly replaced.
THE ACTUAL MANUAL
The manufacturer's installation & service manual, in-app and searchable.
SERVICE DATA AT A GLANCE
Combustion targets with tolerances (CO₂, CO/CO₂ ratio), gas pressures, service-mode steps, technical data and spec sheets — extracted from the manual, with page references.
TOOLS BUILT FOR THE JOB
Gas rate calculator with built-in stopwatch, combustion ratio, temperature rise, expansion vessel sizing, and manufacturer helplines.
FLINT PRO — YOUR AI ONSITE GUIDE
Ask any boiler a question and get answers grounded in its own manual, with page citations. Fault-finding, checks and servicing. £4.99/month or £49/year, cancel anytime.
Flint is reference software for competent professionals: always verify against the manufacturer's current documentation and work within your competence and Gas Safe registration.
Free account (verified email) opens all manuals. From OnSpec Software Ltd.
Flint puts manuals, fault codes and structured service data for 1,000+ UK boiler models one search away — built for Gas Safe engineers who need answers on site, not after a trawl through PDFs.
FIND THE BOILER FAST
Search by model name, range or GC number. Recent boilers stay one tap away.
FAULT CODES THAT EXPLAIN THEMSELVES
50,000+ fault codes with plain-English causes, severity and the parts commonly replaced.
THE ACTUAL MANUAL
The manufacturer's installation & service manual, in-app and searchable.
SERVICE DATA AT A GLANCE
Combustion targets with tolerances (CO₂, CO/CO₂ ratio), gas pressures, service-mode steps, technical data and spec sheets — extracted from the manual, with page references.
TOOLS BUILT FOR THE JOB
Gas rate calculator with built-in stopwatch, combustion ratio, temperature rise, expansion vessel sizing, and manufacturer helplines.
FLINT PRO — YOUR AI ONSITE GUIDE
Ask any boiler a question and get answers grounded in its own manual, with page citations. Fault-finding, checks and servicing. £4.99/month or £49/year, cancel anytime.
Flint is reference software for competent professionals: always verify against the manufacturer's current documentation and work within your competence and Gas Safe registration.
Free account (verified email) opens all manuals. From OnSpec Software Ltd.
Fault codes, manuals & service data for every UK boiler. Your AI onsite guide.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesPersonal info and Financial info
- Data is encrypted in transit
- You can request that data be deleted
What’s new
Boiler age now works for Worcester. Type the serial and Flint works out the make itself.
Search a GC number we hold no manual for and it tells you what the boiler is, instead of no matches.
Fault codes are grouped and in order, with a filter so you can find one by what the display actually shows.
Manufacturer logos on the home screen.
More boilers, more codes, and a lot of wrong manuals tracked down and taken off.
Search a GC number we hold no manual for and it tells you what the boiler is, instead of no matches.
Fault codes are grouped and in order, with a filter so you can find one by what the display actually shows.
Manufacturer logos on the home screen.
More boilers, more codes, and a lot of wrong manuals tracked down and taken off.
App support
About the developer
ONSPEC SOFTWARE LTD
admin@onspecsoftware.com
52 Manor Farm Road
SOUTHAMPTON
SO18 1NQ
United Kingdom
+44 7568 227794