Hi,
I have the above boiler, was commissioned by gas safe engineer just over 5 years ago and has been faultless since until now I have a hive system controlling heating (usual radiators) and hot water and a unvented HW cylinder. All wired up on S plan I believe - separate valves for CH & HW.
Over the past few days I've noticed the house getting cold when the heating is on and when checking the Hive says 'heating' but the boiler is doing nothing. Turning HW on also makes no difference. I can hear and see the hive controller light up the heating and hot water lights and can hear the relay(s) clicking as usual when it does. Looking at the 'Live information' it says 'No Heat Demand:Controller' on the boiler. On a few occasions this has fixed itself by powering the boiler off and on again after a few minutes. However it now appears to not work at all for heating or HW.
I've done a bit of preliminary digging and checked all connections to the hive and boiler PCB. When doing this I noticed a faint ticking sound from the boiler PCB. Not sure if it's unusual as I wouldn't have heard it with the covers on.
I did check with a multimeter and can detect no voltage with respect to neutral on either of the 'RT' terminals on the boiler PCB.
If I put it into 'chimney sweep' mode, the boiler fires up instantly and I get heating/hot water depending on the setting of the hive.
Any pointers as to where I should be looking next? Boiler is just outside of warranty and unfortunately has not had annual servicing either so I think any help from Vaillant is unlikely.
Thanks!
Ted
I have the above boiler, was commissioned by gas safe engineer just over 5 years ago and has been faultless since until now I have a hive system controlling heating (usual radiators) and hot water and a unvented HW cylinder. All wired up on S plan I believe - separate valves for CH & HW.
Over the past few days I've noticed the house getting cold when the heating is on and when checking the Hive says 'heating' but the boiler is doing nothing. Turning HW on also makes no difference. I can hear and see the hive controller light up the heating and hot water lights and can hear the relay(s) clicking as usual when it does. Looking at the 'Live information' it says 'No Heat Demand:Controller' on the boiler. On a few occasions this has fixed itself by powering the boiler off and on again after a few minutes. However it now appears to not work at all for heating or HW.
I've done a bit of preliminary digging and checked all connections to the hive and boiler PCB. When doing this I noticed a faint ticking sound from the boiler PCB. Not sure if it's unusual as I wouldn't have heard it with the covers on.
I did check with a multimeter and can detect no voltage with respect to neutral on either of the 'RT' terminals on the boiler PCB.
If I put it into 'chimney sweep' mode, the boiler fires up instantly and I get heating/hot water depending on the setting of the hive.
Any pointers as to where I should be looking next? Boiler is just outside of warranty and unfortunately has not had annual servicing either so I think any help from Vaillant is unlikely.
Thanks!
Ted