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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 terms of electric components) that was unique to that - the Grundfos UPS2 pump.
Turns out there is a lot on google (and this forum) about this pump causing stuck relays due to a design flaw resulting in current spikes. The manufacturer subsequently released a "suppressor lead" which had never been fitted in my house.
I have now installed the lead and so far no issues. Thanks to everyone who helped me work through it here.
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 terms of electric components) that was unique to that - the Grundfos UPS2 pump.
Turns out there is a lot on google (and this forum) about this pump causing stuck relays due to a design flaw resulting in current spikes. The manufacturer subsequently released a "suppressor lead" which had never been fitted in my house.
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I have now installed the lead and so far no issues. Thanks to everyone who helped me work through it here.
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