Honeywell CM901 User Guide

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Honeywell CM901 Thermostat Specification

The Honeywell CM901 is a sophisticated programmable thermostat designed to enhance energy efficiency and user comfort in residential heating systems. It features a sleek, modern interface with a large, clear LCD display, making it easy to read and adjust settings. The thermostat is equipped with a single-channel control system that allows users to set different temperatures for various times of the day, providing flexibility and precision in managing home heating schedules. With its intuitive 24-hour timer, users can program up to six different time and temperature settings per day, catering to diverse lifestyle needs.

The CM901 utilizes Honeywell’s advanced TPI (Time Proportional Integral) control technology, which ensures accurate temperature control by minimizing temperature fluctuations and maintaining consistent comfort levels. This technology also optimizes energy consumption, resulting in potential cost savings on heating bills. It is compatible with most boilers, including gas, oil, and combi systems, enhancing its versatility across different heating setups.

Installation of the Honeywell CM901 is straightforward, leveraging a two-wire, volt-free connection, which simplifies the integration into existing systems without extensive rewiring. The device is also equipped with a battery-powered backup, ensuring the preservation of programmed settings during power outages.

The CM901 is designed with user-friendly programming features, including a temporary manual override for unexpected schedule changes without altering the preset programming. The thermostat also includes a holiday mode, allowing users to set a constant temperature for a specified period, optimizing energy usage while away. Its elegant design and robust functionality make the Honeywell CM901 an ideal choice for homeowners seeking reliable temperature control with advanced programmability.

Honeywell CM901 Thermostat F.A.Q.

How do I set the temperature on the Honeywell CM901 Thermostat?

To set the temperature, press the up or down arrow buttons on the front of the thermostat until the desired temperature is displayed. The thermostat will automatically save the setting.

What should I do if the Honeywell CM901 Thermostat display is blank?

First, check if the thermostat has power by ensuring the batteries are properly installed and have charge. If the thermostat is hardwired, check the circuit breaker. If the issue persists, consult the user manual or contact customer support.

How can I reset the Honeywell CM901 Thermostat to its factory settings?

To reset the thermostat, press and hold the reset button located inside the battery compartment for about 5 seconds until the display resets.

Why is my thermostat not following the programmed schedule?

Ensure that the thermostat is set to 'Auto' mode. If it is in 'Manual' mode, it will not follow the programmed schedule. Also, verify that the correct day and time are set.

How do I change the batteries in the Honeywell CM901 Thermostat?

To change the batteries, open the battery compartment located at the top of the thermostat, remove the old batteries, and replace them with new AA batteries. Ensure correct polarity.

What does it mean when the Honeywell CM901 Thermostat displays 'Lo Batt'?

'Lo Batt' indicates that the batteries are low and need replacing. Replace them as soon as possible to ensure proper operation.

Can I lock the Honeywell CM901 Thermostat to prevent changes?

Yes, you can lock the thermostat by setting up a PIN code through the advanced settings menu. This prevents unauthorized changes to the settings.

How can I switch the Honeywell CM901 Thermostat between heating and cooling modes?

The CM901 is typically a heating-only thermostat. Ensure you have the correct model if you require cooling functionality. Consult the manual for specific instructions if applicable.

Why is my heating system not responding to the thermostat settings?

Check if the thermostat is set to the correct mode (e.g., 'Auto' or 'Heat'). Verify that the thermostat is properly connected to the heating system. If issues persist, there might be a wiring or system fault requiring professional inspection.

How do I change the time and date on the Honeywell CM901 Thermostat?

Press the 'Time' button, and use the arrow keys to adjust the hour and minute. Press the 'Day' button, and use the arrow keys to set the correct day. Confirm the settings by pressing the 'OK' button.