If you do not remember ( or know ) what the resistance should be you measure the CH and the DHW sensors with the boiler cold and see if they are similar.
A surprising number of boiler MI do not actually give the resistance of the sensors.
My favourite manufacturer gives a graph of the resistance versus temperature!
Tony Glazier
A surprising number of boiler MI do not actually give the resistance of the sensors.
My favourite manufacturer gives a graph of the resistance versus temperature!
Tony Glazier