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I'm attempting to replace a very old traditional thermostat with a Honeywell BDR91 (linked to a Honeywell Y87RF2024 wireless thermostat). The wiring to the current thermostat is very simple - Neutral, Live and a "Switched" Live feed to the boiler, and I'm sure which wire is which on the existing thermostat.
On the BDR91 I've connected the Neutral to Neutral, Live to the "left" Live terminal of the BDR91 and "Switched" Live to the "B" terminal of the BDR91, and also put a link in from the "right" Live terminal to the "A" terminal of the BDR91 - exactly as per the wiring diagram (or at least how I read it).
When I turn the power back on the LED's on the BDR91 light up (so it has power) and it will respond to the wireless thermostat linked to it (and you can hear the relay respond) - but it won't power the boiler up. I'm assuming the "switched" Live feed isn't becoming live.
I can only assume the BDR91 unit is faulty (even though it's brand new) - but my confusion is that even if I link the "A" terminal to the "B" terminal there is still no power to the boiler. If I link the Live feed to the "switched" Live outside of the BDR91 using a terminal block all is fine, and the boiler powers up.
Can anyone suggest what I may be doing wrong ? or why even if the BDR91 isn't switching properly linking the "A" to "B" terminal still doesn't power the boiler.
On the BDR91 I've connected the Neutral to Neutral, Live to the "left" Live terminal of the BDR91 and "Switched" Live to the "B" terminal of the BDR91, and also put a link in from the "right" Live terminal to the "A" terminal of the BDR91 - exactly as per the wiring diagram (or at least how I read it).
When I turn the power back on the LED's on the BDR91 light up (so it has power) and it will respond to the wireless thermostat linked to it (and you can hear the relay respond) - but it won't power the boiler up. I'm assuming the "switched" Live feed isn't becoming live.
I can only assume the BDR91 unit is faulty (even though it's brand new) - but my confusion is that even if I link the "A" terminal to the "B" terminal there is still no power to the boiler. If I link the Live feed to the "switched" Live outside of the BDR91 using a terminal block all is fine, and the boiler powers up.
Can anyone suggest what I may be doing wrong ? or why even if the BDR91 isn't switching properly linking the "A" to "B" terminal still doesn't power the boiler.