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Honeywell CM 921 Manual

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Symptom Possible Cause Remedy
The thermostat has a blank LCD
screen.
Batteries not installed.
Check to see if there are batteries in the battery
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.
The thermostat shows a flashing
symbol on the LCD screen.
Batteries are exhausted and
need replacing.
Replace with new batteries.
The thermostat’s LCD display
shows a symbol but the
heating does not switch on.
The heating is not required
at this moment.
The heat demand is send to the BDR91 as a value
between 0-100%. The BDR91 will adjust the boiler
on time to meet this requirement. That is why the
heating will be off sometimes even if the symbol is
displayed. To check if RF system is communicating
properly press the button to increase the set
temperature a few degrees above the current
temperature. The heating should come on after a few
seconds.
The thermostat shows a flashing
symbol on the LCD
screen.
Fault in thermostat Remove and re-insert the batteries in the thermostat.
If the symbol does not clear itself in a few
minutes call the installer.
Troubleshooting Guide
FAQ’s & TROUBLESHOOTING
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