Honeywell CM721 Programmable Room Thermostat User Guide

Honeywell CM721 Manual: Questions and Answers

What does the flashing square symbol mean on the Honeywell CM721 display?

It highlights the active programming period you're currently adjusting. User Guide, p. 11

Can I remove unused time periods from the CM721 heating schedule?

Yes. Periods 2 to 4 can be disabled. Navigate to the unwanted period using the PROGRAM buttons, ensure it's highlighted by the flashing square, then press and hold the button for at least 2 seconds to remove it. User Guide, p. 11

How do the temperature adjustment buttons work on the CM721?

Press the up or down buttons to change the temperature. Each press adjusts by 0.5°C increments between 5°C and 35°C. User Guide, p. 4

How long do batteries last in the Honeywell CM721 before replacement?

About 2 years before needing replacement. The thermostat monitors battery power and displays a flashing symbol when running low. User Guide, p. 14

What temperature range does the Honeywell CM721 support in manual mode?

5°C to 35°C in 0.5°C steps. User Guide, p. 14

Where is the push button located on the Honeywell CM721 thermostat?

The push button is on the BDR91 relay box, which is normally mounted close to the boiler. User Guide, p. 6

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