To Next PageTo Next PageWhat to do if Honeywell Thermostat receiver box does not react to setpoint changes?
If the receiver box isn't responding to temperature adjustments on the thermostat, the thermostat and receiver box might not be properly connected. Reset the receiver box by holding the push button for 15 seconds. After that, you will need to follow the binding procedure.
Why is the red LED on my Honeywell Thermostat Relay Box illuminated?
If the red LED on your Honeywell Thermostat Relay Box is illuminated, it means communication has been lost. This can happen if the Relay Box isn't receiving RF messages from the thermostat, often because the RF signal is blocked due to the thermostat's location, or the thermostat batteries are dead. Try relocating the thermostat, following the instructions in section 2, or replace the batteries in the thermostat.
What to do if Honeywell CM900 Relay Box does not react to setpoint changes?
If your Honeywell Thermostat's Relay Box isn't reacting to temperature adjustments made on the thermostat, it could be that the thermostat and Relay Box aren't properly connected. Try resetting the Relay Box by holding the push button for 15 seconds. Then, redo the binding procedure as detailed in section 5.
Why is the red LED on and the green one flashing after binding my Honeywell Thermostat?
If, after binding your Honeywell Thermostat, the red LED remains on and the green LED flashes every 3 seconds on the Relay Box, it indicates an incorrect or incomplete binding process, possibly due to the thermostat's position during binding. Repeat the binding procedure, ensuring the thermostat is approximately 1 meter away from the Relay Box.
Why is the red LED on my Honeywell CM900 Thermostat receiver box illuminated?
The red LED indicates a loss of communication. This happens when the receiver box isn't getting radio frequency (RF) signals from the thermostat, possibly because the RF signal is blocked due to the thermostat's location or the thermostat batteries are dead. Try relocating the thermostat, or replace the batteries.
How to fix red LED on after binding procedure on Honeywell Thermostat?
If the red LED is on and the green one flashes every 3 seconds after binding, the binding procedure was probably done incorrectly, or the thermostat was too far away during binding. Repeat the binding procedure, keeping the thermostat about 1 meter away from the receiver box.
What to do if Honeywell CM900 Thermostat displays a symbol, but the receiver box relay doesn't switch on?
If the thermostat shows a symbol but the receiver box relay isn't activating, adjust the temperature setpoint by a few degrees using the button. The receiver box should activate the relay after a short delay.
General| Brand | Honeywell |
|---|---|
| Model | CM900 |
| Category | Thermostat |
| Language | English |
Details the steps for installing the receiver box, including placement and wiring for different boiler types.
Guides through powering up the thermostat and performing an RF communication check.
Details how to verify the complete system installation is correct after setup.
Explains how the receiver box manages heat demand based on thermostat signals.
Describes how to manually override the system and its return to automatic control.
Covers what happens during communication loss and the receiver box failsafe mode.
Details the procedure for accessing and navigating the installer settings menu.
Configures the receiver box behavior during loss of RF communication.
Lists settings for different heating/cooling applications like boilers and zone valves.
Explains features like optimisation, heating/cooling modes, and temperature offsets.
Provides detailed tables for category 1 (Room Thermostat) and category 2 (System) settings.
Explains the process for pairing or re-pairing system components.
Discusses compatibility and setup for multi-zone heating systems.
Lists common symptoms, possible causes, and remedies for installation issues.
Details how to access diagnostic information and model details.
