My dad has a conventional indirect heating system (Y-plan i think, vented, pumps thru a diverter valve, switching to HW tank/radiators).
When switching on the Randal 103 timer switch the boiler & pump comes on but the boiler shuts down after about 5 mins or less. At this stage the pipe at the bottom of the HW tank has become hot but the pipe at the top is still cold.
If you slide the diverter valve lever over to manual, all three pipes to & from the valve are equally as hot. The boiler remains on and the radiators get hot as expected.
Being green to this kind of fault I disconnected both pipes to the HW tank to ensure that the tank coil is clear which it is.
Apologies for not having the full manuafacture information yet since I am assisting my dad & I haven't recorded the full details yet.
Perhaps someone may be able to comment in principle on what the cause might be for there being no HW with the lower pipe getting hot but the upper pipe remaining cold? I'll get more info tonight when I call in the hope someone can advise.
Many thanks.
When switching on the Randal 103 timer switch the boiler & pump comes on but the boiler shuts down after about 5 mins or less. At this stage the pipe at the bottom of the HW tank has become hot but the pipe at the top is still cold.
If you slide the diverter valve lever over to manual, all three pipes to & from the valve are equally as hot. The boiler remains on and the radiators get hot as expected.
Being green to this kind of fault I disconnected both pipes to the HW tank to ensure that the tank coil is clear which it is.
Apologies for not having the full manuafacture information yet since I am assisting my dad & I haven't recorded the full details yet.
Perhaps someone may be able to comment in principle on what the cause might be for there being no HW with the lower pipe getting hot but the upper pipe remaining cold? I'll get more info tonight when I call in the hope someone can advise.
Many thanks.
