---
product_id: 48345105
title: "Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package"
brand: "honeywell"
price: "1202 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Honeywell"
url: https://www.desertcart.ro/products/48345105-honeywell-st9400c-programmer-7-2-channel-3-on-off-per
store_origin: RO
region: Romania
---

# 7-day programmable precision Largest ever backlight display Auto summer/winter time change Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package

**Brand:** honeywell
**Price:** 1202 Lei
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay cozy, stay smart — the future of heating control is here! 🔥

## Quick Answers

- **What is this?** Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package by honeywell
- **How much does it cost?** 1202 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/48345105-honeywell-st9400c-programmer-7-2-channel-3-on-off-per)

## Best For

- honeywell enthusiasts

## Why This Product

- Trusted honeywell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Upgrade:** Direct replacement for ST6400 with zero rewiring hassle
- • **Smart Scheduling:** 7-day or 5/2 day operation with 3 on/off cycles per day for ultimate control
- • **Adaptive Timekeeping:** Automatic daylight saving adjustments keep your heating on point year-round
- • **Effortless Visibility:** Largest backlit LCD display ensures clear programming anytime
- • **Plug & Play Installation:** Quick setup with existing backplate saves time and avoids costly plumber visits

## Overview

The Honeywell ST9400C Programmer is a modern, 7-day electronic heating controller designed for easy replacement of older models like the ST6400. Featuring a large backlit LCD, automatic summer/winter time adjustment, and flexible scheduling with up to three on/off periods per day, it offers precise, hassle-free control of central heating and hot water systems. Its plug-and-play design fits existing backplates, enabling quick installation without rewiring, making it the smart choice for efficient home heating management.

## Description

Product Description The ST9400C in a 7-day Electronic Programmer which provides accurate time control for central heating systems with separate programmes for heating and hot water. ST9400C is suitable for replacing a wide range of programmers on the market and is a direct replacement for Honeywell ST6400 Programmers without the need for re-wiringThis Version replaces some of the following previous Honeywell Models: ST6400C1003 ST6400C1052.St9400 programmers can be combined with other Honeywell Controls such as Room Thermostats, Cylinder Thermostats, Wiring Centres and Zone or Diverting Valves to form a fully automatic central heating control system.Legal DisclaimerAny circuit boards cannot be returned if seal has been broken as incorrect diagnostics could cause damage to these parts. Legal Disclaimer Please check your local laws before purchasing this product. All manufacturers Terms and Conditions apply. Please see Manufacture of product website for full details before buying. PLEASE READ AND FOLLOW ALL INSTRUCTIONS. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains 1 x ST9400C1000 Programmers See more

Review: Great replacement for the Honeywell ST6400C - Easy and simple to install and programme. - I brought the ST9400C to replace the ST6400C which had seen better days. The ST9400C is a direct replacement for the ST6400C and as such has been cleverly designed to sit on the same back plate as the ST9400C. This means no need to rewire, drill new holes or the need to call a plumber. All you do slacken two securing screws at the bottom of the ST9400C hinge the unit up to separate the backplate and main body of the ST9400C into two halves. You do the same process on the ST6400C, switch off your electricity supply at the mains and simply fit the ST9400C main body onto the existing ST6400C backplate. It is as simple as that, jobs done, hassle free and quick. The ST9400C unit comes complete with a simple to follow ‘quick programming guide’ which really makes light work of programming your hot water and heating needs. From start to finish I had replaced my old ST6400C with the new ST9400C and programmed it in no more the 15mins. I love the fact that the ST9400C even adjusted itself when the clock’s went back for winter. If I had to criticise anything it would be that the buttons do sometimes tend to stick behind the plastic body of the ST9400C, however pressing the buttons delicately seemed to solve the issue. I highly recommend the ST9400C. I have read issues about reliability of the ST9400C but since installing the unit about a month ago I have not had a single problem.
Review: Bringing Warmth Back To A Frozen House! - Bought as a replacement for a simpler (and possibly even prehistoric) Honeywell controller that had died rather suddenly after many many years of service (and left us without heating or hot water until we figured out the problem). The controller is simple to install (I used a wiring chart that I found online that detailed how the wiring on the new controller related to the wiring on the old controller) and even simpler to operate. The LCD screen is bright and clear and informative - the default setting is to have the screen lit, but it will remain lit at all times (a little disconcerting initially). There are a host of settings that can be tweaked (including whether the LCD display is lit or not), and even the programming of the device is simple, making it easy to have different settings for each day or to copy the settings from one day to the next. There are even built in programs that you can use if you don't want to set your own. Simple to use, not unpleasant to look at, quick and easy to fit (at least as a replacement) & (so far at least) reliable.

## Features

- Now with LoT Technology
- Our Largest ever Backlight Display
- Factory set Clock
- Automatic Summer/Winter time change
- 7 Day or 5/2 Day operation
- Product may comes in white box or plastic package

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003DV6ACA |
| Batteries | 2 Unknown batteries required. |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 46,635 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,582 in Heating & Cooling |
| Certification | 2006/95EC and 2004/108/EC |
| Colour | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (868) |
| Date First Available | 24 Mar. 2010 |
| Display style | LCD or LED with backlight |
| Finish | Matte |
| Included Components | 2 unknown batteries |
| Item Package Quantity | 1 |
| Item Weight | 290 g |
| Item model number | ST9400C |
| Manufacturer | Honeywell |
| Material | Plastic |
| Number of Pieces | 1 |
| Part Number | ST9400C |
| Pattern | Backlight Display |
| Plug profile | Wall Mount |
| Power Source | Corded Electric |
| Shape | Rectangular |
| Size | 1 |
| Special Features | Programmable |
| Style | Modern |
| Usage | Indoor use only |
| Voltage | 24 |

## Product Details

- **Brand:** Honeywell
- **Colour:** White
- **Connectivity technology:** Wi-Fi
- **Controller type:** Push Button
- **Included components:** 2 unknown batteries
- **Model name:** ST9400C
- **Product dimensions:** 35D x 145W x 99H centimetres
- **Special feature:** Programmable
- **Specific uses for product:** Indoor use only
- **Temperature Control Type:** Digital

## Images

![Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package - Image 1](https://m.media-amazon.com/images/I/51OIxwl6IlL.jpg)
![Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package - Image 2](https://m.media-amazon.com/images/I/510TVVaiKmL.jpg)

## Questions & Answers

**Q: will this replace a honewell st6400c programer ??**
A: I had a ST6400C an I purchased this item and it fitted exactly. There are two screws at the base and when the ST6400C was removed the replacement fitted in its place. I was given the information initially by my service engineer

**Q: The description says: "now with lot technology". (that's capital l and capital t, but this site changes them to small l t!)  what is lot technology?**
A: LoT means "Line of Text" and refers to the programmer display in response to any button pressed or slider moved. It enables an installer or user to set the programmer without needing to refer to a manual.

**Q: I presume this is hard wired to the boiler. Where can I get a wireless version of it?**
A: Sorry try the Honeyline technical help email they were v helpful

**Q: Dose this controller replace the potterton 2002**
A: Yes, the Honeywell ST9400c is logically similar to the Potterton 2002, so could be used as a replacement. However you will need to replace the backplate (fixed to your wall) and the order of the wires will change ~ this should not be a problem for your electrician ~ if you intend to replace the backplate yourself make sure you connect the wires to the correct terminals. The ST9400C comes complete with a new backplate.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great replacement for the Honeywell ST6400C - Easy and simple to install and programme.
*by R***L on 16 November 2013*

I brought the ST9400C to replace the ST6400C which had seen better days. The ST9400C is a direct replacement for the ST6400C and as such has been cleverly designed to sit on the same back plate as the ST9400C. This means no need to rewire, drill new holes or the need to call a plumber. All you do slacken two securing screws at the bottom of the ST9400C hinge the unit up to separate the backplate and main body of the ST9400C into two halves. You do the same process on the ST6400C, switch off your electricity supply at the mains and simply fit the ST9400C main body onto the existing ST6400C backplate. It is as simple as that, jobs done, hassle free and quick. The ST9400C unit comes complete with a simple to follow ‘quick programming guide’ which really makes light work of programming your hot water and heating needs. From start to finish I had replaced my old ST6400C with the new ST9400C and programmed it in no more the 15mins. I love the fact that the ST9400C even adjusted itself when the clock’s went back for winter. If I had to criticise anything it would be that the buttons do sometimes tend to stick behind the plastic body of the ST9400C, however pressing the buttons delicately seemed to solve the issue. I highly recommend the ST9400C. I have read issues about reliability of the ST9400C but since installing the unit about a month ago I have not had a single problem.

### ⭐⭐⭐⭐⭐ Bringing Warmth Back To A Frozen House!
*by R***S on 5 October 2016*

Bought as a replacement for a simpler (and possibly even prehistoric) Honeywell controller that had died rather suddenly after many many years of service (and left us without heating or hot water until we figured out the problem). The controller is simple to install (I used a wiring chart that I found online that detailed how the wiring on the new controller related to the wiring on the old controller) and even simpler to operate. The LCD screen is bright and clear and informative - the default setting is to have the screen lit, but it will remain lit at all times (a little disconcerting initially). There are a host of settings that can be tweaked (including whether the LCD display is lit or not), and even the programming of the device is simple, making it easy to have different settings for each day or to copy the settings from one day to the next. There are even built in programs that you can use if you don't want to set your own. Simple to use, not unpleasant to look at, quick and easy to fit (at least as a replacement) & (so far at least) reliable.

### ⭐⭐⭐⭐⭐ Replaced old unit in a matter of minutes
*by G***N on 27 January 2025*

Genuine part and so easy to set up I had to replace the existing controller because the buttons became "tired" and matter how hard I pressed I decided to bite the bullet and buy a new unit. I didn't even have to set the clock because it had retained the time and date in the memory. The buttons are working fine now. I should have replaced it sooner and saved myself a few months of grief!

## Frequently Bought Together

- HONEYWELL ST9400C Thermostat Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White, 1
- Honeywell T6360B1028 Room Thermostat, 230/240V, White, 1
- Honeywell L641A1039 Cylinder Stat, 230 V

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-22*