Recent content by GeoffreyGodwin

I thought I would post an update because I am fairly confident I have resolved the issue. Searching for things like "neostat stuck relay" was not giving much in the way of an answer. Mulling it over for a while I considered why it was only happening downstairs and there was only one thing (in...

Yes I think the left valve is upstairs (radiators) and right valve is for the downstairs (ufh).

I've just given this a quick try having had a bit more time before I set off with the neoStat upstairs (downstairs is back to Slimline). It now seems to work as intended, whether that was due to the taps or not I do not know. Very bizarre behaviour. How long it will stay like this is anyone's...

I'll give that a try but I won't be able to until next week. I have disassembled and this seems to be the offending part, an HF46F relay (the slimline uses a HF49F). There's no visible signs of damage. I could try replacing the relay but I would need to be very accurate with the...

I've just done the continuity test and unfortunately A1 links to A2 even when everything else is unplugged. I suppose this makes sense because it did seem to work for the first few minutes I tried it including turning off, which suggests they fused over a few minutes of operation. What I am...

Presumably I could rule out the relay contacts being fused (which would have to have happened on both) by disconnecting the entire unit and running a continuity test on A1 and A2? There is no heatmiser control box for the neoStat Wifi. They are meant to run independently.

I don't think so. The fact that replacing with the Slimline resolves the issue suggests it is something to do with the way the neoStats are interacting with the rest of the system. Even though the wiring should be exactly the same according to the manual. I also noticed that when A2 is...

ok - did that on both neostats and still firing.

I think the only way I can power the neostat down is by turning off the fused spur shown in the picture above. This stops the firing (and also turns off the UFH pump).

I don't have a multi-meter at the moment but disconnecting A2 stops the firing.

The default sensor is "built in" which is what it should be using. If I try to change it to the floor or air probes I get error codes (and incidentally it still calls for heat).

No, they are "meshed" to my wifi router. According to the product page, no neohub is required. In addition, after a factory reset (unpairing the wifi router) the same behaviour happens.

Thanks. It still calls for heat even though both downstairs and upstairs thermostats are in standby mode. Also attached is a picture of the UFH setup.

Not sure if this helps but I bought a second neoStat Wifi and replaced it - same issue. Does it matter that this is for UFH? The pump is constantly running which it wasn't with the previous Heatmiser slimline.

My Heatmiser Slimline was recently replaced by a Heatmiser Neostat Wifi. The wiring was kept the same, i.e. permanent live to L, permanent neutral to N, the live linked to A1 and the boiler to A2. However, when this is done the boiler fires irrespective of whether the thermostat is calling for...