TROUBLESHOOTING THE CM721
Symptom |
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| Remedy |
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Blank Display (Power Loss). | Check batteries are installed by removing the battery | |||||
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| cover. |
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| Check batteries have been installed in the correct | |||
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| orientation. |
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| Replace the batteries. | |||
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Display shows flashing | The batteries in the thermostat are low on power | |||||
symbol. |
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| - Replace the batteries. | |||
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Display shows |
| symbol. | A fault has occurred in your heating system. Remove | |||
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| and | |||
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| If the |
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| symbol does not clear after a few minutes |
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| |||
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| contact your installer. | |||
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Display shows the word 'SERVICE' | Your installer has set a scheduled maintenance alert | |||||
|
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| period on your CM721 as a recommendation that your | |||
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| heating system should receive a routine inspection. | |||
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| Call your installer to arrange a maintenance visit. | |||
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| Note: The CM721 and heating system will continue to | |||
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| operate as normal. | |||
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BDR91 red LED is constantly on | RF communication lost due to the wrong location of | |||||
or flashing |
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| the room unit - Hook the room unit back on the wall | |||
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| bracket where RF communication was reliable. | |||
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| Call installer |
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| NOTE: You can control the boiler manually when the | |||
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| RF communication is lost: Press the BDR91 push | |||
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| button to switch the boiler on and off. When the green | |||
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| LED is on – the boiler is on. | |||
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7
