Honeywell CM900 manual Trouble Shooting Guide, Diagnostic Mode

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6) Trouble Shooting

6.1 Trouble Shooting Guide

Symptom (Fault

Possible Cause

Remedy

 

Message)

 

 

 

 

 

 

 

The room thermostat

This is normal operation. The Relay Box cycles

Using the

button change the

displays the symbol but

the relay on and off for times proportional to

temperature setpoint by a few degrees.

the Relay Box relay does

the demand signal (0-100%) from the room

The Relay Box should switch the relay on

not switch on.

thermostat. The symbol only indicates that the

after a few seconds delay.

 

demand value is greater than 0%.

 

 

 

 

 

The Relay Box does not

The room thermostat and Relay Box are not

Reset the Relay Box by pressing and

react to setpoint changes

bound.

holding the push button for 15 seconds.

on the room thermostat.

 

Then follow the binding / rebinding

 

 

procedure as described in section 5)

 

 

Additional Installation Information.

 

 

 

After the binding procedure

Incorrect or incomplete binding procedure.

Repeat the binding procedure.

the red LED is on and the

Incorrect position of the room thermostat during

Repeat the binding procedure keeping

green one is flashing once

binding.

approx. 1 m distance between the Relay

every 3 sec on the Relay

 

Box and the room thermostat.

Box.

 

 

 

 

 

 

 

 

The red LED on the

The Relay Box receives no RF messages from

 

 

Relay Box is illuminated

the room thermostat:

 

 

(Communication loss)

RF signal is blocked due to wrong location of the

Re-locate the room thermostat following

 

 

room thermostat.

instructions in section 2) Installing the

 

 

CM900 Wireless System.

 

Room thermostat batteries are exhausted.

Replace batteries in the room thermostat.

 

 

 

 

6.2 Diagnostic Mode

The CM927/921 room thermostat has a user accessible mode that provides information useful to a remote service person and a means of checking whether the boiler is working. To access this move the slider switch to the OFF position then press and hold the button for 5 seconds. The room thermostat will enter

the user settings mode. Next press and hold the and buttons together. The room thermostat will hold the relay on for 5 minutes and the following information can be viewed on the display by pressing the

or buttons. : model ID, date code (WW/YY) & checksum.

Hereby, Honeywell declares that this CM927/CM921 room thermostat and BDR91 Relay Box are in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC, 2006/95/EC and 2004/108/EC.

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised Representative Honeywell International Inc.

Honeywell Control Systems Ltd.

Arlington Business Park, Bracknell, Berkshire RG12 1EB

Technical Help Desk: 08457 678999 www.honeywelluk.com

50039987-003 A

© 2009 Honeywell International Inc.

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Contents Table of Contents DescriptionInstallation Information Installing the CM900 Wireless System Installing the Relay BoxInstalling the Room Thermostat 2.2.1 Power Up RF Communication Check Test ModeLocating the Room Thermostat System CheckInstaller Mode Basic Operation of the SystemAutomatic Operation Temporary Manual OverrideEntering Installer Mode BDR91 Relay Box Fail-Safe Mode SetupUsing the Room Thermostat for Specific Applications Using the Special Features of the Room ThermostatCategory 1 Parameters Room Thermostat Settings Category 2 System Settings Additional Installation Information Binding / Rebinding ProcedureMulti-Zone System Binding an HR80 Radiator Controller to the Room ThermostatTrouble Shooting Trouble Shooting GuideDiagnostic Mode

CM900 specifications

The Honeywell CM900 is a sophisticated programmable room thermostat designed to enhance energy efficiency and ensure optimal comfort in residential settings. This device is characterized by its advanced features, which cater to the increasingly demanding needs of modern households.

One of the standout features of the CM900 is its intelligent programming capabilities. Users can easily set different heating schedules for weekdays and weekends, allowing for personalized comfort that adapts to the household's routine. This programmable functionality not only maximizes comfort but also contributes to energy savings, as it can automatically lower the heating during unoccupied periods.

The CM900 is equipped with a user-friendly interface that makes it straightforward to adjust settings. The large, clear display provides essential information at a glance, such as current room temperature and set points. Additionally, the intuitive menu navigation allows users to customize settings quickly, ensuring a seamless experience even for those who may not be technically inclined.

Incorporating the latest technology, the Honeywell CM900 features an innovative adaptive control system. This technology enables the thermostat to learn the heating characteristics of the home, adjusting pre-heat times to ensure that the desired temperature is reached precisely when needed. As a result, users can enjoy comfortable living spaces without wasting energy.

The CM900 also boasts an impressive response time, ensuring that any adjustments to the heating system occur swiftly. Coupled with precise temperature sensing, this allows for a stable indoor climate, which is essential for both comfort and energy efficiency. The device can be connected to various heating systems, making it a versatile option for a range of home heating configurations.

For those interested in further customizing their heating experience, the Honeywell CM900 offers compatibility with multiple accessories, including remote sensors and Wi-Fi connectivity options. This enables homeowners to monitor and adjust their heating systems even when they are away from home, leading to added convenience and peace of mind.

In summary, the Honeywell CM900 is a high-performance programmable thermostat that combines advanced technology with user-centric features. Its intelligent scheduling, adaptive control, and ease of use make it an excellent choice for anyone looking to achieve a perfect balance between comfort and energy efficiency in their home.
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