PC2000 - everything seems ok but no hot water in afternoon

Hi, my PC2000 seems to be working fine, the pump works, both heating elements work, and the Pump Speed Control PCB seems to be fine (if I decrease the hot water flow rate from a tap the pump slows down). However, once the heat stored off peak finishes there is no more hot water. Sometimes it randomly comes back, but there doesn't seem to be a set 'pattern' for this. Any suggestions?

Thanks

Riccardo

Check the stats.
Even try swapping them over.
Mike

I have come across the situation a few times, I do agree with Mike, check the stat, if that is fine it could be 1 element is faulty or the PHE/DHW sensors are not working 100%.