glow worm energy firing for hot water when no demand

[MethodPH]

Fitted a glow worm energy yesterday and is firing for hot water when there isnt a hot water demand, there are no leaks anywhere. Even when heating is calling the hot water demand is still overiding even though no hot taps are open. Has anyone got any ideas?

 

[ShaunCorbs]

Turn the cold off to the boiler does it still fire / switch to hot water ?

 

[MethodPH]

Turn the cold off to the boiler does it still fire / switch to hot water ?

I’ll give it a try tomorrow, what to you reckon that could be?

 

[Phill K]

Turn the cold off to the boiler does it still fire / switch to hot water ?

Turning off the cold is going to confirm that there’s no leak somewhere. If it still keeps firing for DHW I’d say a dodgy hot water thermistor, harness, board. But that’s not your issue then. It’s Vaillants as you’ve proved there’s no demand 👍

 

[MethodPH]

Turning off the cold is going to confirm that there’s no leak somewhere. If it still keeps firing for DHW I’d say a dodgy hot water thermistor, harness, board. But that’s not your issue then. It’s Vaillants as you’ve proved there’s no demand 👍

Cheers for that, still in my first year as a qualified gas engineer. Things were much simpler when I was just a plumber

 

[Phill K]

Cheers for that, still in my first year as a qualified gas engineer. Things were much simpler when I was just a plumber

Give it time, and anything you aren’t sure of. Ask!!
I, like so many others started out as a plumber now I work for a boiler manufacturer. It will benefit you because you’ll see the plumbing faults causing issues with a boiler Rather than just parts swapping.

 

[Scott_D]

Does it have Pre heat turned on?