Peugeot 308 - P1351 Error: Preheating & Holding Relay Circuit - No Disturbing Signals Detected

Hello, I connected my 308 to the computer and the P1351 error appeared Circuit of the preheating and holding relay. I do not feel any disturbing signals, the car fires normally and does not lose power. I connected it because of the radiator fan speed 2 when the air-conditioning was started, but there was only this error. On the forum I read that usually with this error there is a problem with firing and smoke from the exhaust. I don't have anything like that. Should something be done about it? Should the subject be left until specific symptoms appear? Regards

General error regarding glow plug heating. It may even be one candle out of order. The longer you ride with one, the greater the chance that it will break when you try to unscrew it.

Generally, it turned out to be a problem with the glow plug, but as it is only 1, I did not replace it and it runs without problems also in winter.