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Message 1 of 9

Bt synergy cordless phone

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Why is a C showing on the phone screen and there is terrible interference on the line 

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Message 2 of 9

Re: Bt synergy cordless phone

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@JenniferMelvin45 

Who provides your phone service?

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Message 3 of 9

Re: Bt synergy cordless phone

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Bt is the provider,  problem happened after a power cut which last only a second 

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Message 4 of 9

Re: Bt synergy cordless phone

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@JenniferMelvin45 wrote:

Bt is the provider,  problem happened after a power cut which last only a second 


Remove the power to the base unit for about a minute, and that should clear the problem which can be caused by a short power loss.

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Message 5 of 9

Re: Bt synergy cordless phone

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Sorry but no luck the phone  is still displaying C  have checked batteries they are ok

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Message 6 of 9

Re: Bt synergy cordless phone

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@JenniferMelvin45 wrote:

Sorry but no luck the phone  is still displaying C  have checked batteries they are ok


Has the noise gone away? You may also have to check the date and time is correct.

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Message 7 of 9

Re: Bt synergy cordless phone

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Hi @JenniferMelvin45   Looking at the user guide it is not C-0 flashing? This means that the date and time needs to be set on the answering machine.

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Message 8 of 9

Re: Bt synergy cordless phone

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Wow not sure how but it appears to be ok, suddenly it made a strange noise from the base unit and cleared itself, thank you for your help very grateful 

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Message 9 of 9

Re: Bt synergy cordless phone

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@JenniferMelvin45 wrote:

Wow not sure how but it appears to be ok, suddenly it made a strange noise from the base unit and cleared itself, thank you for your help very grateful 


A short mains interruption can disrupt the internal software communications. I am pleased its now working.

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