will this replace a honewell st6400c programer ??

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

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?

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.

I presume this is hard wired to the boiler. Where can I get a wireless version of it?

Sorry try the Honeyline technical help email they were v helpful

Dose this controller replace the potterton 2002

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.

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Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package

Honeywell ST9400C Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White - Bulk Package

Product ID: 48345105

Details

Brand
Honeywell
Colour
White
Connectivity technology
Wi-Fi
Controller type
Push Button
Included components
2 unknown
Model name
ST9400C

⚡24V direct replacement power

💡Largest ever backlit display

🕒7-day programmable precision

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Description

🔥 Upgrade your heating game with smart precision 🕒

DUAL CHANNEL CONTROL - Separate heating & hot water programs for tailored comfort
SMART TIME MANAGEMENT - Auto summer/winter clock adjustment keeps you on schedule
BRIGHT CLEAR DISPLAY - Largest backlit LCD ensures easy visibility day or night
EFFORTLESS PROGRAMMING - Intuitive button control with quick-start guide included
SEAMLESS UPGRADE ZERO REWIRING - Fits existing ST6400 backplate for hassle-free swap

The Honeywell ST9400C Programmer is a 7-day, 2-channel digital heating controller featuring the largest backlit LCD display in its class. Designed as a direct, no-rewire replacement for the popular ST6400 model, it offers effortless installation and programming with automatic summer/winter time adjustments. Ideal for modern homes seeking precise, customizable heating and hot water schedules, it combines smart functionality with user-friendly controls to keep your environment perfectly timed and comfortable.

Specifications

ASIN	B003DV6ACA
Backlight	Yes
Best Sellers Rank	12,187 in DIY & Tools ( See Top 100 in DIY & Tools ) 707 in Heating & Cooling
Brand Name	Honeywell
Colour	White
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Touch
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.5 4.5 out of 5 stars (868)
Display Type	LCD or LED with backlight
Finish Type	Matte
Global Trade Identification Number	05025121388412
Included Components	2 unknown batteries
Item Dimensions D x W x H	35D x 145W x 99H centimetres
Item Shape	Rectangular
Item Type Name	Programmer. 7 day, 2-channel, 3 on/off per day
Item Weight	290 Grams
Manufacturer	Honeywell
Manufacturer Part Number	ST9400C
Material Type	Plastic
Model Name	ST9400C
Model Number	ST9400C
Mounting Type	Wall Mount
Number of Batteries	2 Unknown batteries required.
Power Source	Corded Electric
Product Style	Modern
Special Features	Programmable
Specific Uses For Product	Indoor use only
Specification Met	2006/95EC and 2004/108/EC
Temperature Control Type	Digital
UPC	772040469917
Unit Count	1.0 count
Voltage	24

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