Hi Looking for a bit of advice before calling out a heating engineer.
We have a quite old Potterton Boiler which is well maintained. It has just recently developed an intermittent problem where in the mornings neither the CH or HW comes on via the controller.
If I manually boost or advance the timer then the boiler fires up ans the system is fine.
Now being a sparky I automatically thought it must be a faulty controller so swapped out the Tempus 7 for a new Drayton LP522 but this is showing the same fault.
Now the odd thing is that both CH and HW come on automatically in the evening but not mornings so I'm thinking it must be a valve sticking somewhere? The boiler is in the attic so could be affected by cold.
Could it be the 3 port valve (this is a Draytom MA1) sticking? Or as the boiler isn't firing (pump and fan a re running) is it more likely to be the gas valve, and hence a callout?
Any suggestions welcome.
We have a quite old Potterton Boiler which is well maintained. It has just recently developed an intermittent problem where in the mornings neither the CH or HW comes on via the controller.
If I manually boost or advance the timer then the boiler fires up ans the system is fine.
Now being a sparky I automatically thought it must be a faulty controller so swapped out the Tempus 7 for a new Drayton LP522 but this is showing the same fault.
Now the odd thing is that both CH and HW come on automatically in the evening but not mornings so I'm thinking it must be a valve sticking somewhere? The boiler is in the attic so could be affected by cold.
Could it be the 3 port valve (this is a Draytom MA1) sticking? Or as the boiler isn't firing (pump and fan a re running) is it more likely to be the gas valve, and hence a callout?
Any suggestions welcome.