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Honeywell ST9400C User Manual

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User manual (19 pages)

Installation instructions (2 pages)

User manual (18 pages)

Table Of Contents

Table of Contents

Features
Controls Layout
Contents
General Description
The Way to Use a Programmer
Setting the Date and Time
Running a Built-In Programme
Programming
The Built-In Programmes
Your Personal Programme
Reviewing the Programme Times
Modifying the Hot Water Programme
Copying One Day's Programme to Another Day
Programming a Different Day
Exiting Hot Water Programming Mode
Modifying the Heating Programme
Exiting Heating Programming Mode
Disabling/Enabling Time Periods - for Heating And/Or Hot Water
Operating
Overriding the Operation Without Changing the Programmes
The Extra Hour Function - for Heating And/Or Hot Water
The Holiday Function
Fune Tuning
Changing from AM/PM Time Display to the 24 Hour Clock
Changing the Installer Parameters
To Enter Installer Mode
To Exit Installer Mode
Faq
Troubleshooting Guide
Mini-Programmer Operating Instructions
Modifying the Heating and Hot Water Programme
Exiting Heating and Hot Water Programming Mode
Disabling/Enabling Time Periods
Choosing the Operating Mode
Override and Extra Hour Functions
Configuration Data - to be Completed by Installer
What Is a Programmer?

Quick Links

1 Controls Layout
2 The Way to Use a Programmer
3 Modifying the Hot Water Programme
4 Modifying the Heating Programme
5 Troubleshooting Guide
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Table of Contents

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Questions and answers

colin attwood

March 6, 2025

the ST94000C when started keeps clicking on and off

1 comments:

Mr. Anderson

March 6, 2025

The Honeywell ST9400C keeps clicking on and off when started because the relays are not latching correctly. This issue began after the system was shut off, drained, refilled, and restarted. The buzzing and display turning on and off suggest a possible fault with the programmer, such as a component issue or power instability.

This answer is automatically generated