17

Troubleshooting Guide

Symptom

Possible Cause

Remedy

 

 

 

 

 

 

 

 

 

CM907 has a blank LCD

Batteries not installed

Check to see if there are batteries in the battery

screen

 

compartment and the paper tab has been removed

 

 

 

 

 

 

 

 

Incorrect battery orientation

Check that the batteries have been installed in the

 

 

 

 

correctorientation

 

 

 

 

 

 

 

 

 

 

Exhausted batteries

Replace with new batteries

 

 

 

 

 

CM907 shows a flashing

Batteries are exhausted and

Replace with new batteries

 

symbol on the LCD screen

need replacing

 

 

 

 

 

 

 

 

The CM907’s LCD screen

No power to heating system

Check that there is power to the heating system.

works but the heating does

 

 

 

 

 

 

 

 

 

 

 

 

not switch on

Program does not call for

Move the slider switch to MAN and press

or to

 

 

 

heat

increase the temperature a few degrees above the

 

 

 

 

current room temperature. The heating should come

 

 

 

 

on after a few seconds.

 

 

 

 

 

 

 

 

 

CM907 not connected to

Call installer to check electrical connection between

 

 

 

boiler properly

the CM907and the boiler.

 

 

 

 

 

 

Heating switches ON or OFF

CM907 not set correctly for

Call Installer

 

 

too slowly or quickly

your system

 

 

 

 

 

 

 

 

 

 

Temperature swings between

CM907 not set correctly for

Call Installer

 

 

too hot and too cold.

your system

 

 

 

 

 

 

 

 

CM907 shows a flashing

Fault in CM907

Remove and re-insert the batteries in the CM907.

 

 

symbol on the LCD

 

If the

 

 

symbol does not clear itself in a few

screen

 

minutes call the installer

 

 

 

 

 

 

 

 

 

 

Page 17
Image 17
Honeywell CM907 manual Troubleshooting Guide, Symptom Possible Cause Remedy

CM907 specifications

The Honeywell CM907 is a sophisticated programmable room thermostat designed to enhance energy efficiency while providing comfort and convenience in residential and commercial heating systems. As a part of Honeywell’s acclaimed suite of heating controls, the CM907 combines functionality with modern aesthetics, ensuring an appealing design without sacrificing performance.

One of the standout features of the CM907 is its advanced programmable capabilities. This thermostat allows users to tailor their heating schedules according to their lifestyle, enabling savings on energy costs. The ability to set different temperature profiles for weekdays and weekends is particularly beneficial, providing flexibility that aligns with varying routines. With its intuitive interface, users can easily navigate through options to customize heating patterns throughout the week.

The CM907 operates on an open window detection technology, which is a crucial element for energy conservation. This feature senses sudden drops in room temperature, typically indicative of an open window, and automatically adjusts the heating to prevent unnecessary energy wastage. Such intelligent features not only promote sustainability but also contribute to lower energy bills.

Moreover, the CM907 supports both 24V and 230V heating systems, making it compatible with a wide range of applications, including systems using gas, oil, or electric heating. This versatility means homeowners and contractors can deploy the CM907 across various installations without concern for compatibility issues.

Another significant characteristic of the CM907 is its large, clear display, which facilitates easy reading and settings adjustments. Backlit for visibility in low-light conditions, this display enhances user experience by making temperature settings and programming straightforward, even for those less familiar with technology.

The Honeywell CM907 also integrates well with smart home systems, allowing for remote access and adjustments through Wi-Fi applications. While it may not possess the full capabilities of some advanced smart thermostats, its compatibility with home automation systems makes it a valuable addition for many users looking to modernize their heating controls.

In summary, the Honeywell CM907 is a remarkable programmable thermostat that blends efficient technology with user-friendly features. Its programmable scheduling, open window detection, compatibility with various heating systems, and smart home integration potential make it a powerful tool for both energy management and comfort. For anyone seeking an economical solution to maintain optimal room temperatures, the CM907 stands out as a reliable and efficient choice.