Alfa Laval Micro
Installation, service and operating instruction
45
Diagnostic mode, CM721
14.1
The CM721 room thermostat has a user accessible mode that provides information useful to a remote service
person and a means of checking whether the boiler is working.
To access this:
1. Press the OFF button, then press and hold the button for 5 seconds.
2. The room thermostat will enter the user settings mode.
3. Next press and hold the and buttons together.
4. The room thermostat will hold the relay on for 5 minutes and the following information can be viewed
on the display by pressing the or button. :
Model ID, date code (WW/YY) & checksum.
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