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  • Flint: Boiler Onsite Guide screenshot 1
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About Flint: Boiler Onsite Guide

Flint is the onsite guide for UK gas engineers. The manufacturer's manual, the fault codes, the service figures and the fault-finding chart for 2,300+ domestic gas boilers, in your pocket and ready before you've unclipped the case. FIND IT FAST • 2,300+ gas boilers across 45 manufacturers, one page per boiler. Search by make and model, by the maker's own code, or by the GC number off the badge: Flint names the appliance from the official product register and checks the manual really covers your number • 60,000+ fault codes: what it means, the likely cause, and the parts that usually get changed. Every code traced to the manual it came from • 1,000+ manufacturers' manuals with full-text search, so you land on the page instead of thumbing through ninety of them • Service figures for 2,100+ models: combustion targets at max and min rate with the maker's tolerance band, gas pressures, service mode, gas valve settings, sensor tables. Every figure cites the manual page it came from, and every wiring table, service-mode procedure and combustion figure has been read back against that page FAULT-FINDING CHARTS Older boilers have no fault codes; the manual gives a flowchart. Flint walks it with you, one box at a time: the question, Yes or No, the next box, into the LED table where the chart hands over, and on to the section it sends you to. 1,100+ boilers, with the manual page always one tap away. ASK FLINT Type a question in plain English and get an answer built from that boiler's own manual, with the page cited so you can check it. It reads the manual faster than you can. It doesn't decide, it doesn't sign anything off, and it won't go past what the manufacturer printed. You're the engineer. Flint just fetches. TOOLS • Gas rate, with a built-in stopwatch, metric and imperial • Tightness test with the let-by and stabilisation timers, and the permitted drop for your meter • CO/CO₂ ratio against the 0.004 limit • Temperature rise (ΔT) and expansion vessel sizing • Boiler age from the serial number, decoded from the maker's own scheme and showing its arithmetic so you can check it • Unsafe situations: tap through what you've found and get the IGEM/G/11 classification, ID, AR or NCS, with the action that goes with it. A paraphrased summary written for speed on site, not the standard itself, and no substitute for your judgement • Every manufacturer's UK technical helpline, tap to call BUILT FOR THE VAN, NOT THE OFFICE Dark, glare-friendly screen. Big, tappable controls. Made for standing at the boiler, not sitting at a desk. WHO IT'S FOR Gas Safe registered engineers, heating and plumbing engineers, and apprentices who want the manual and the fault code without the faff. SUBSCRIPTION One subscription, everything above included. New subscribers get the first 7 days free. Monthly: 7 days free, then £3.99 per month Annual: 7 days free, then £29.99 per year Payment is charged to your Apple Account at confirmation of purchase, or at the end of the free trial. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. Manage your subscription and turn off auto-renewal in your Apple Account settings after purchase. Terms of Use: https://flintfix.com/terms.html Privacy Policy: https://flintfix.com/privacy.html Flint is a product of OnSpec Software Ltd.

What’s new

Version 1.4.4 · Updated October 21, 2026

Scan the badge. Tap the camera in the search box, point it at the boiler's data badge, and Flint reads the GC number and opens the boiler. No typing with gloves on. Read it to me. Service-mode procedures and fault-finding steps now have a speaker button. Put the phone down, keep both hands in the boiler, and Flint reads the steps out.

App privacy

The developer, Onspec Software, reported these privacy practices to Apple.

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Contact Info: Name
  • Other Data: Other Data Types

Used for: App Functionality

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Purchases: Purchase History
  • Identifiers: Device ID, User ID
  • Contact Info: Email Address
  • User Content: Other User Content

Used for: Third-Party Advertising, Developer’s Advertising or Marketing, Analytics, App Functionality

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