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Drayton LP522SI Error Code P15 and constant resetting

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Webmannie

Hi,
Our Drayton Heating controller (LP522SI) has stopped working and is continually rebooting itself with a P15 error code. When it is outwith the programmed operating times it doesn't 'reboot' and shows the time, i can move to the options off/time/once but it will not go to ON on either Heating or Water. Tapping either boost makes no difference. Once the operating time comes round again it starts rebooting again.

I've tried unlatching the controller off for 10 mins, makes no difference.

Any ideas?
 
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SimonG
SimonG
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