# Wiring & Controls - Diagrams — user reviews

> 4 indexed App Store user reviews of Wiring & Controls by Mr Combi Training, rated 1.00/5 from 2 ratings.

- Source: https://appshunter.io/ios/app/wiring-and-controls-diagrams/id1021997871/reviews
- App overview in markdown: https://appshunter.io/ios/app/wiring-and-controls-diagrams/id1021997871.md
- Rating breakdown: 5★ 0 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 2

## Most critical reviews (4 lowest-rated)

### 1/5 — Worthless App

*2018-05-26*

This app is only of use if you are a HVAC tech, and then only if you are using a very selective type of controls.  Total waste o my money!

### 5/5 — Excellent

*2021-03-28, version 1.5*

Also enjoyed the live training.

Thankyou , George.

### 5/5 — Every gas engineers bible!!

*2019-03-27, version 1.5*

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.

### 5/5 — Excellent

*2016-04-24, version 1.0*

Clear diagrams 
Excellent guide to use Easy and accurate

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*