With special permission from Danfoss and Honeywell, we took their wiring diagrams and turned them into fantastic coloured wiring diagrams which are much easier to follow. We've been using these diagrams on our training course for over two years and everyone agrees that they're essential for wiring up controls on two and three port installations.

• Colour diagrams for Danfoss and Honeywell systems
• 2 and 3 port systems
• Fully Wired diagrams - Shows every wire in the control circuit
• Live Wire diagrams - The earth and neutral wire have been removed for clarity
• Schematic diagrams - A simplified version of the circuit
• Stats diagrams - Only the thermostat circuit is shown
• Danfoss and Honeywell wiring centre schematics
• Frost protection diagrams
• Fault finding charts for Danfoss systems

What’s New

Version 1.5

We've added a diagram for Danfoss 3 x Two-Port systems

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

Big man Ed ,

Every gas engineers bible!!

I use this app every time there’s a wiring problem. Simple to use and always gets me out of trouble.
Just one request...please can you add a wiring diagram for “2 zones on a combi boiler”.
I came across a vaillant combi that had 2 zones, heating & underfloor heating. This would make this app a step above the rest.

Blue 345 ,


Clear diagrams
Excellent guide to use Easy and accurate

App Privacy

The developer, Mr Combi Training, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Mr Combi Sales Ltd.
31.2 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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