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by RickRB
Wed Aug 14, 2019 8:18 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: How do I Know if an old Honywell T40 wall Thermostat is Still Working?
Replies: 2
Views: 2939

Re: How do I Know if an old Honywell T40 wall Thermostat is Still Working?

Thanks for reply. I have a better understanding of how the system works. Boiler service is at end of month and I will get the thermostat checked out too. Will get him to explain what is going on at the boiler end on my system. No need to worry on safety aspects. Whilst I am happy to replace light fi...
by RickRB
Thu Aug 08, 2019 3:23 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: How do I Know if an old Honywell T40 wall Thermostat is Still Working?
Replies: 2
Views: 2939

How do I Know if an old Honywell T40 wall Thermostat is Still Working?

I have an old Honywell T40 wall thermostat that I dont use, in fact the dial is broken. I believe it is the original so 42 years old!! We have had 2 new boiler replacements over the years and now have a Glowworm 30 and no longer have hot water cylinder or header tank. We also have individual radiato...
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