Turned everything off to let water cool down. Swapped T1 wire to L terminal and turned back on (without connecting the receiver front) and boiler immediately fired up. Guess this means we can take the Hive out of the equation?
This is the normally line terminal used to put three port valve in fully over position if you set DWH off and CH on, with CH off it does not do a thing. Well it can hold the three port valve all the way across, but it will not fire boiler. This wire must be line for the boiler to fire up to supply DHW if central heating not running.
REALLY appreciate you walking me through steps to troubleshoot the problem. Turned water permanently on via Hive and water still piping hot. Turned everything off to let water cool down. Swapped T1 wire to L terminal and turned back on (without connecting the receiver front) and boiler immediately fired up. Guess this means we can take the Hive out of the equation?
This points to a wiring fault, not anything wrong with Hive or motorised valve. It would seem most likely some one has tried to by-pass the wall thermostat in the wiring centre. As shown here but in error they have bridged the wrong pair.
With a picture of wiring centre we may see error, these two wires should be bridged at wiring centre end, maybe we can work out what has been bridged in error. But it may need some one with test gear to work out what has been done.
It would seem most likely some one has tried to by-pass the wall thermostat in the wiring centre. As shown here but in error they have bridged the wrong pair.
Although not fully clear, the issue was reported to have happened after the Hive was replaced and not after the BDR91 was linked out. Could @YorkColin clarify?
Although not fully clear, the issue was reported to have happened after the Hive was replaced and not after the BDR91 was linked out. Could @YorkColin clarify?
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