Have an Optimax HE31c which is throwing an A3 error but only when the central heating has been on and you then run a bath and then go to top the bath up with hot.
Have replaced the two temp sensors for HW and CH any pionters ?
What does the diverter valve do ?
I have a list of Perameter Mode settings could it be a timing issue when switching between CH and HW where the pump is not turning after switching to HW making the CH to overheat ?
Any pointers.
Have replaced the two temp sensors for HW and CH any pionters ?
What does the diverter valve do ?
I have a list of Perameter Mode settings could it be a timing issue when switching between CH and HW where the pump is not turning after switching to HW making the CH to overheat ?
Any pointers.