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Honeywell CM921 Manual

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FAQ’s & TROUBLESHOOTING
Symptom Possible Cause Remedy
The thermostat’s LCD display
works but the heating does not
switch on (BDR91 LEDs are off
or green one is on).
No power to heating system. Check that there is power to the heating system.
Program does not call for
heat.
Move the slider switch to MAN and press or to
increase the temperature a few degrees above the
current room temperature. The heating should come
on after a few seconds.
Wrong electrical connection. Call electrical installer to check the boiler and BDR91
power supply as well as the connection between the
boiler and the BDR91.
The red LED on the BDR91 is
constantly on or flashing.
RF communication lost due
to the wrong location of the
thermostat.
Hook the
thermostat
back on the wall bracket or
replace the
thermostat
on the table stand in the
position where RF communication was reliable.
RF communication fault.
Call installer.
NOTE: You can control the boiler manually when the RF
communication is lost: Press the BDR91 push button
to switch the boiler on and off. When the green LED is
on – the boiler is on.
Heating switches ON or OFF too
slowly or quickly.
The thermostat not set
correctly for your system.
Call Installer.
Temperature swings between
too hot and too cold.
The thermostat not set
correctly for your system.
Call Installer.
… 13 …


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  • can a new CM921 Honeywell unit be fitted to existing receiver Submitted on 12-10-2021 at 14:30

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