Buongiorno, come da manuale e codici errore caldaia (vedi manuale uso e manutenzione) l’errore E99 indica un anomalia alla scheda di controllo e gestione della caldaia stessa. Ma Attenzione che non è sempre così! In alcuni casi il problema o meglio “l’errore E99” potrebbe essere causato dal mal funzionamento della sonda NTC sanitaria. In questi casi sarebbe meglio provare a sostituire la sonda sanitaria e poi successivamente la scheda principale.
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