Just had a Ultracom 30 hxi installed with weather compensator, Climapro and Smart Wiring Centre. System works well when running on modulating burn on CH only but when it automatically goes to full burner power for HW demand, the burner cuts out after very short bursts.The temp indicator shows it is heating OK, but it seems to me the Grundfos 15-50 pump (which is on max speed ) is giving insufficient flow to take the heat away from the boiler quickly enough. It was a 15-50 pump on old system and this has been replaced like for like.
Should I look to get a 15-60 pump instead?
Many thanks for any advice you can give.
Should I look to get a 15-60 pump instead?
Many thanks for any advice you can give.
