We're getting hot water into the rads when the DHW is turned on, even though I have got it on summer setting. We've had the diverter valve replaced only yesterday and the hot water seems fine but still getting hot water going to the rads..........any ideas what else it could be please ?
Its a Vaillant EcoTech Pro combi, I'm not sure what he replaced, says on the paperwork it was a diverter valve, the work was carried out by British Gas. The boiler is only 18 months old and only comes with one year guarantee.
BG have been back and replaced the diverter again but I am still having the same problem, the water sometimes gets properly hot but other times just luke warm and rads getting hot.They are now at a loss to what it could be, they are coming back again tomorrow for the 4th time. HTG engineer, have you any idea what else it could be at all please ?
I think I would check any external controls to be sure they a functioning and wired correctly.
Are the rads warm 24/7 or does the fault occur occasionally? When does it happen? What are the conditions when it happens? Does the boiler fire up when there is no call for hot water. Does it shut down as soon as the hot tap is turned off. Has it been like this from new?
To find obscure faults, every factor is important, and often even the smallest clue can help discover the answer.
The Vaillant engineer has been and gone and after scratching his head for a bit has changed the PCB after first changing some wiring.
It seems to have done the trick but as its an intermitent fault a bit too early to tell.