no hot water

[robbie g]

hot water only comes on when the heating is on can anyone say what might be the problem

 

[dontknowitall]

Possibly the zone valve is broken.

Unlikely, but the switch selecting Hot Water or HW/Central Heating might be broken or have a loose connection.

Hopefully others will come up with more sensible suggestions.

 

[sonray ltd]

what type of system or boiler is it ? combi etc.