6) Trouble Shooting
6.1 Trouble Shooting Guide
Symptom (Fault | Possible Cause | Remedy |
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Message) |
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The room thermostat | This is normal operation. The receiver box | Using the | button change the | |
displays the symbol but | cycles the relay on and off for times proportional | temperature setpoint by a few degrees. | ||
the receiver box relay does | to the demand signal | The receiver box should switch the relay | ||
not switch on. | thermostat. The symbol only indicates that the | on after a few seconds delay. | ||
| demand value is greater than 0%. |
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The receiver box does not | The room thermostat and receiver box are not | Reset the receiver box by pressing and | ||
react to setpoint changes | bound. | holding the push button for 15 seconds. | ||
on the room thermostat. |
| Then follow the binding / rebinding | ||
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| procedure as described in section 5) | ||
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| Additional Installation Information. | ||
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After the binding procedure | Incorrect or incomplete binding procedure. | Repeat the binding procedure. | ||
the red LED is on and the | Incorrect position of the room thermostat during | Repeat the binding procedure keeping | ||
green one is flashing once | ||||
binding. | approx. 1 m distance between the receiver | |||
every 3 sec on the receiver | ||||
| box and the room thermostat. | |||
box. |
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The red LED on the | The receiver box receives no RF messages from |
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receiver box is illuminated | the room thermostat: |
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(Communication loss) | RF signal is blocked due to wrong location of the | |||
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| room thermostat. | instructions in section 2) Installing the | ||
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| CM900 Wireless System. | ||
| Room thermostat batteries are exhausted. | Replace batteries in the room thermostat. | ||
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6.2 Diagnostic Mode
The CM927/921 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 move the slider switch to the OFF position then press and hold the 
button for 5 seconds. The room thermostat will enter
the user settings mode. Next press and hold the 
and 
buttons together. 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 
buttons. : model ID, date code (WW/YY) & checksum.
Hereby, Honeywell declares that this CM927/CM921 room thermostat and HC60NG receiver box are in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC, 73/23EC and 89/336EC.
“Manufactured for and on behalf of the Environment and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell International Inc.”
Honeywell Control Systems Ltd.
Arlington Business Park, Bracknell, Berkshire RG12 1EB
Technical Help Desk: 08457 678999 www.honeywelluk.com
© 2006 Honeywell International Inc.
